MOT Risk Index.co.uk

Kia Rio — MOT statistics 2024

The Kia Rio failed 30.68% of 98,818 first MOT attempts in 2024 ("first-time", excluding retests). Adjusted for the age of the fleet, its initial-failure ratio is 106.8 (100 = expected for its age profile). This car fails its MOT about 7% more often than expected for its age.

MOT risk index 106.8, 95% CI 105.8–107.8 (100 = national average) 100 106.8 0 200
Index
106.8
100 = age-normal
Raw fail rate
30.68%
n = 98,818
Dangerous /100
12
national ≈11
Diesel − petrol
+11.5 pp
fail-rate gap
Rank
532 of 761
lower index = better

Age-adjusted peer: Nissan Micra (index 106.0) — the two published results are 0.8 index points apart.

Kia Rio common problems: what actually fails the MOT

Steering stands out at 6.1 per 100 tests, against 2.3 per 100 tests across UK vehicles of the same ages.

higher bar = fails more oftenrate per 100 tests

Kia Rio common problems: what actually fails the MOT — 2024 UK MOT data

family vs national — matched to UK vehicles of the same ages — top component groups, per 100 tests. Legend: This family · National avg. Combined labels: family / national average. A gap here reflects how these vehicles are driven, used and maintained as well as how they were built — an MOT defect is a test outcome, not a breakdown.

Component-group comparison table

Each ratio carries a 95% interval. With 6 groups compared here, roughly one apparent difference in twenty is chance alone.

GroupThis familyCases behind itUK, same agesFamily / national
Lamps & electrical15.287,21413.81.10×1.10–1.11
Suspension14.180,63812.41.14×1.13–1.14
Brakes12.973,8179.51.36×1.35–1.37
Visibility9.755,3437.11.37×1.35–1.38
Tyres9.152,0628.81.04×1.03–1.05
Steering6.134,8482.32.70×2.67–2.72
Named defects — items per 100 initial tests, this family vs UK national average; this model measured on 572,396 tests, 2019-2024, national column 2024
What failedper 100 tests (this family)per 100 tests (UK average)ratio family / UKWhat to check
Suspension joint dust cover missing or no longer…A suspension joint dust cover missing or no longer prevents the ingress of dirt etc4.111.782.30×Listen for knocks over bumps — worn joints show up on the test
Steering ball joint with excessive wear or free playA steering ball joint with excessive wear or free play3.461.222.83×Ask the seller about: A steering ball joint with excessive wear or free play
Suspension joint dust cover severely deterioratedA suspension joint dust cover severely deteriorated3.631.901.91×Listen for knocks over bumps — worn joints show up on the test
Wiper blade missing or obviously not clearing the…Wiper blade missing or obviously not clearing the windscreen3.312.221.49×Check wipers, washers and windscreen chips in the driver's view
Rear registration plate lamp or light source…A rear registration plate lamp or light source missing or inoperative in the case of multiple lamps or light sources3.752.831.33×Try every light and switch — lamps are a top failure
Tyre tread depth not in accordance with the…Tyre tread depth not in accordance with the requirements4.123.591.15×Check tyre tread depth across the full width
Brake lining or pad worn below 1.5mma brake lining or pad worn below 1.5mm2.442.151.13×Feel for brake judder and pulling on the test drive
Lamp missing, inoperative or in the case of a…A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning2.232.091.07×Try every light and switch — lamps are a top failure
Tyre seriously damagedA tyre seriously damaged2.552.541.00×Check tyre tread depth across the full width
Suspension pin, bush or joint excessively wornA suspension pin, bush or joint excessively worn3.994.870.82×Listen for knocks over bumps — worn joints show up on the test

Named defects ranked by how much more often they appear than the national average — not by raw rate.

Kia Rio MOT advisories: what gets flagged

Tyres are highest at 41.8 per 100 tests; Body & structure are lowest at 3.1 per 100 tests — the gap is 38.7 per 100 tests.

higher bar = flagged more oftenadvisory items per 100 initial tests

Kia Rio MOT advisories: what gets flagged — 2024 UK MOT data
Advisory rates table
GroupAdvisories per 100
Tyres41.8
Brakes38.2
Suspension19.5
Non-component advisories7.1
Steering3.6
Body & structure3.1

Advisories are wear the tester noted but didn't fail — what will need money soon.

Tyres, brakes and suspension: Kia Rio against cars of the same age

AgePartKia RioSame age, petrol and dieselDifference
3 yearsTyres3.714.17-0.46
3 yearsBrakes1.221.77-0.55
3 yearsSuspension0.320.63-0.31
4 yearsTyres5.044.540.50
4 yearsBrakes2.342.43-0.09
4 yearsSuspension0.721.21-0.49
5 yearsTyres5.375.060.31
5 yearsBrakes3.353.090.26
5 yearsSuspension1.452.19-0.74
6 yearsTyres5.835.540.29
6 yearsBrakes4.183.810.37
6 yearsSuspension3.323.72-0.40
7 yearsTyres6.415.950.46
7 yearsBrakes5.494.550.94
7 yearsSuspension6.815.681.13
8 yearsTyres6.956.310.64
8 yearsBrakes6.915.381.53
8 yearsSuspension10.377.782.59

Failing items per 100 initial tests, 2019-2024. The comparison group is every petrol or diesel car tested at the same age, so weight and drivetrain show up rather than fleet age.

If a car like this fails, does it fail again?

A failure rate does not say whether a failure is a one-off or the start of something. This follows the same vehicles into their next ordinary MOT a year later — retests after a repair are excluded, because they follow a failure by definition. 2019-2024.

After this year's testFails next yearVehicles followed
It failed36.3%33,264
It passed25.7%314,770

A failed test raises next year's chance of failing again by 10.6 percentage points. The failure most likely to come back is identification of the vehicle — 38.1% of those vehicles fail again next year. Some of this is the vehicle and some is the owner: a car that was let go once tends to be let go again. One caveat: a car that fails may be sold or scrapped rather than tested again, so these figures describe the vehicles that came back.

Adjusted for how much these are actually driven

The headline index adjusts for the fleet's age. Wear, though, follows mileage: a three-year-old taxi and a three-year-old garage queen sit in the same age band. These two rows compare every car with vehicles of the same age, and then with vehicles of the same age and the same annual mileage, 2019-2024, on 570,485 tests. Both stand on the six-year corpus so they are measured on identical data — compare them with each other, not with the headline index above, which is measured on 2024 alone.

Standardised forIndexReading
Age only107.5fails more often than expected
Age and annual mileage114.3fails more often than vehicles driven as much
Share doing under 3,000 miles a year8.7%a normal spread of use

Mileage matters here: matching on how much these are driven moves the figure by 6.8 points — this fleet is driven less than the vehicles it is measured against, so the age-only view flatters it — but it does not change which side of normal the car sits on. One limit to keep in mind: mileage is partly a result of how often a car breaks down — one that spends weeks in the workshop covers fewer miles — so the mileage-matched figure can understate a real weakness. Tests with no usable odometer reading are left out of it.

How the Kia Rio compares with cars of its own age and size

Not against the whole fleet — against cars of the same size class tested at the same age, 2019-2024.

AgeKia RioSame class, same ageDifferenceTests
3 years9.19%11.31%-2.12 pp36,709
4 years14.14%14.24%-0.1 pp42,676
5 years18.14%17.41%+0.73 pp50,642
6 years20.89%20.75%+0.14 pp56,281
7 years24.63%24.32%+0.31 pp60,085
8 years28.51%28.15%+0.36 pp59,245
9 years32.5%32.02%+0.48 pp57,746
10 years37.73%35.58%+2.16 pp52,413
11 years40.52%38.64%+1.88 pp43,572
12 years43.4%41.23%+2.17 pp34,760
13 years45.26%43.28%+1.98 pp26,413
14 years46.67%45.03%+1.64 pp19,530
15 years48.38%46.31%+2.08 pp12,986
16 years50.09%47.34%+2.75 pp7,637
17 years49.79%47.79%+2 pp4,748
18 years50.25%47.99%+2.26 pp2,846
19 years49.01%47.74%+1.28 pp1,469
20 years50.07%47.36%+2.71 pp741

Raw first-time failure rates within each age, so fleet age cannot flatter either side. A positive difference means this model fails more often than its own class at that age.

How does the Kia Rio perform as it gets older?

The Rio at age 20 stands out at 50.9%, against 41.0% for all vehicles of the same age.

higher = larger sharecompare shares in percentage points

How does the Kia Rio perform as it gets older? — 2024 UK MOT data

Chart axes: car age, years · failure-rate scale 0–55%.

Takeaway: a 10-year-old Rio has roughly a 33% chance of failing its MOT; from about age 10 it stays above the national age curve.

Data table
AgeKia RioAll vehiclesGap
38.1%12.4%-4.4 pp
413.9%13.1%+0.7 pp
515.8%15.1%+0.7 pp
615.6%17.5%-1.9 pp
717.6%20.2%-2.6 pp
822.4%23.3%-0.9 pp
924.0%26.5%-2.5 pp
1033.3%30.1%+3.2 pp
1138.2%33.2%+5.0 pp
1241.3%35.7%+5.6 pp
1345.3%38.2%+7.1 pp
1444.8%40.4%+4.4 pp
1545.8%41.6%+4.2 pp
1650.7%43.1%+7.6 pp
1751.2%43.1%+8.1 pp
1850.5%43.9%+6.6 pp
1949.1%43.5%+5.6 pp
2050.9%41.0%+9.8 pp

Is a Kia Rio ULEZ compliant?

The share of classifiable 2024 Kia Rio MOT tests likely ULEZ compliant by first-registration date is 83.2%.

Based on 98,736 classifiable initial MOT tests. This describes the tested fleet, not a specific car. MOT data do not record Euro class, so likely compliance is inferred from fuel and first-registration date. For the only authoritative answer, check the registration with TfL's official ULEZ checker.

higher = larger share likely compliantinferred from fuel and first-registration date; not a recorded Euro class

Age-band estimate from classifiable initial MOT tests
Vehicle age at testLikely ULEZ-compliant shareTests
Under 3 yearsSuppressed — sample below publication threshold
Check a registration with TfL
n = 234
3–5 years100.0%
Check a registration with TfL
n = 11,934
6–7 years100.0%
Check a registration with TfL
n = 13,797
8 years100.0%
Check a registration with TfL
n = 8,807
9 years88.1%
Check a registration with TfL
n = 11,360
10–14 years73.6%
Check a registration with TfL
n = 42,770
15–17 years69.1%
Check a registration with TfL
n = 7,856
18 years56.0%
Check a registration with TfL
n = 911
19 yearsSuppressed — sample below publication threshold
Check a registration with TfL
n = 493
20+ years0.0%
Check a registration with TfL
n = 574

Kia Rio petrol vs diesel: which ages best

Diesel is highest at 40.2%; Hybrid is lowest at 9.2% — the gap is 31.0 percentage points.

higher = larger sharecompare shares in percentage points

Kia Rio petrol vs diesel: which ages best — 2024 UK MOT data
Fuel split table
FuelTests% failingGap vs best
Petrol77,57028.7%+19.5 pp
Diesel19,74940.2%+31.0 pp
Hybrid1,4979.2%+0.0 pp

Chart sample sizes: n=78k · n=20k · n=1,497.

How dangerous are Kia Rio MOT failures?

Major defects are well below the reference at 45.9 per 100 tests, against 52.8 per 100 tests nationally.

higher bar = fails more oftenrate per 100 tests

How dangerous are Kia Rio MOT failures? — 2024 UK MOT data
Severity table
SeverityThis family /100National /100Family / national
Minor16.1514.221.14×
Major45.9252.750.87×
Dangerous11.5511.151.04×

Chart values: Minor 16.1 · Major 45.9 · Dangerous 11.6.

Per 100 tests on this family. National average: Minor 14.2 · Major 52.8 · Dangerous 11.2 per 100.

Does the month of a Kia Rio MOT matter?

Nov is highest at 32.3%; Jun is lowest at 27.3% — the gap is 5.0 percentage points.

higher = larger sharecompare shares in percentage points

Does the month of a Kia Rio MOT matter? — 2024 UK MOT data

Chart scale: 26%–34%.

bars: Kia Rio · dashed: all class-4 cars

Month-by-month table
MonthKia RioAll vehiclesGap
Jan30.96%31.12%-0.2 pp
Feb29.44%29.99%-0.5 pp
Mar28.04%28.26%-0.2 pp
Apr29.75%29.78%-0.0 pp
May29.39%28.79%+0.6 pp
Jun27.32%28.15%-0.8 pp
Jul29.07%29.33%-0.3 pp
Aug29.18%29.2%-0.0 pp
Sep28.94%28.19%+0.8 pp
Oct31.11%30.34%+0.8 pp
Nov32.27%30.58%+1.7 pp
Dec31.07%29.33%+1.7 pp

Takeaway: the spread between best and worst month is 5.0 percentage points — noticeable seasonality. Seasonality partly reflects registration-date clustering, not weather.

Before reading the shape: most of it is not about cars. Britain changes its registration plates twice a year, and 18.9% of these cars were first registered in March with another17.1% in September — 36% in two months against the 17% an even spread would give. An MOT falls due three years after first registration, so the buying calendar becomes the testing calendar. That shapes how many cars are tested each month — not how often they fail: the busiest months here are not the worst ones, so read the failure line on its own and the volume behind it separately.

Kia Rio average mileage by age

At age 8, the middle half of Rios runs from 34,983 miles to 65,262 miles, against 49,043 miles as the median.

further right = more milesmedian is the typical car; band is p25–p75

Bars: Kia Rio · dashed: all class-4 cars — 2024 UK MOT data

Chart axes: car age, years · odometer scale 0–118k mi.

Does high mileage mean more Kia Rio MOT failures at the same age?

Within the same age group, split by odometer (2024 MOTs), so this separates wear from age: at ages 10–14, 23.4% of those with under 40,000 miles failed first time versus 51.2% of those with over 140,000 miles.Inside this age group, higher mileage goes with more failures.

Does high mileage mean more Kia Rio MOT failures at the same age? — 2024 UK MOT data
Kia Rio: first-time failure by mileage within each age group (2024)
AgeOdometer% failing95% intervalTests
3–5<40k miles11.4%10.8–12.1%9,943
3–540-70k miles19.3%17.5–21.2%1,804
3–570-100k miles28.6%22.2–36%161 (rough estimate)
6–9<40k miles14%13.4–14.7%12,017
6–940-70k miles21.5%20.8–22.1%15,239
6–970-100k miles29.6%28.4–30.8%5,419
6–9100-140k miles34.7%32–37.6%1,137
6–9140k+ miles40.8%33.3–48.7%152 (rough estimate)
10–14<40k miles23.4%22.2–24.7%4,555
10–1440-70k miles35.3%34.5–36.1%13,994
10–1470-100k miles42.7%41.9–43.5%14,818
10–14100-140k miles48.7%47.6–49.8%7,771
10–14140k+ miles51.2%48.7–53.6%1,628
15+<40k miles32%29–35.1%891
15+40-70k miles43.2%41.4–45.1%2,708
15+70-100k miles50.4%48.6–52.1%3,187
15+100-140k miles55.1%53.1–57.1%2,344
15+140k+ miles56.7%53–60.3%697

line: median · band: middle half of the fleet (p25–p75)

Mileage by age (p25 / median / p75)
Agep25Medianp75Tests
312,51318,65027,1603,689
416,12223,62132,5483,373
520,77129,86440,6054,872
626,31837,40549,8635,721
732,10145,24061,1798,076
834,98349,04365,2628,807
941,31556,45574,05811,360
1048,63665,98884,89311,047
1155,42273,78493,6139,921
1261,25781,439102,9488,970
1357,19778,836101,6986,805
1458,66781,678105,6926,028
1557,36579,538104,4684,680
1665,12387,164110,1642,018
1766,25489,257112,5891,159
1863,14288,067112,828911
1956,45778,401104,189493
20+48,48966,06286,718574

A typical 8-year-old Rio has ~49,043 miles on the clock. Much more — ask why; much less — check for gaps in the MOT history.

Where in Britain the Kia Rio fails its MOT most

Llandrindod Wells area is highest at 43.1%; Kingston upon Thames area is lowest at 20.2% — the gap is 22.9 percentage points.

higher = larger sharecompare shares in percentage points

Where in Britain the Kia Rio fails its MOT most — 2024 UK MOT data
Toughest areas% failingvs model overall
Llandrindod Wells (LD)43.09%+13.4 pp
Hull (HU)38.24%+8.6 pp
Aberdeen (AB)37.52%+7.9 pp
Sunderland (SR)37.46%+7.8 pp
Salisbury (SP)36.26%+6.6 pp
Easiest areas% failingvs model overall
Kingston upon Thames (KT)20.21%-9.4 pp
Enfield (EN)22.18%-7.5 pp
Romford (RM)22.74%-6.9 pp
Sutton (SM)23.47%-6.2 pp
Bromley (BR)23.82%-5.8 pp

Why do areas differ?

For each external factor we correlate the area fail rate with the factor across postcode areas that have ≥800 tests of this family, then compare the bottom vs top fifth (quintile) of the factor. Correlation, not causation — factors travel together (the north is colder and often poorer; urban areas are denser and less salted). Road surface condition is joined now, for the 91 English areas the DfT publishes, and it explains nothing: the correlation with suspension failures is −0.01 and with body and structure failures 0.07. Potholes wreck wheels and tyres between tests, but by the time a car reaches the bay the road it drives on leaves no measurable trace.

In areas with the highest mot centre density this model fails 6.3 pp more often than in the lowest fifth (r=0.58, n=114 areas with ≥800 tests).

In areas with the highest urban share this model fails 5.0 pp less often than in the lowest fifth (r=-0.39, n=114 areas with ≥800 tests).

In the most coastal fifth of areas this model fails 3.1 pp more often than in the most inland fifth (r=-0.35, n=114 areas with ≥800 tests).

Kia Rio Why do areas differ? — 2024 UK MOT data
Values shown in the quintile chart
FactorLow QHigh QGapCorrelation
MOT centre density25.9%32.2%+6.3 ppr=0.58
Urban share31.9%26.9%-5.0 ppr=-0.39
Distance to coast31.8%28.7%-3.1 ppr=-0.35

Factors that only mean something combined

Some conditions are useless on their own and informative multiplied together. Frost days alone say little — Britain barely freezes. Salt tonnage alone says little — it tracks frost. Distance to the sea alone says little. Multiply the first two and divide by the third and you get an index of how hard an area attacks a car's underside, and it lines up with the corrosion defects we actually record. We built five such combinations and tested each against our own data. Three survived; two did not, and the failures are listed here on purpose — a proxy that was never checked is decoration. One survivor only survived on the second attempt: built from a crude stand-in for street parking it failed outright, and rebuilt from the census — terraced streets carrying more cars than they have driveways — it works, and carries information the salt index does not.

Composite area indicators, each tested against a defect rate we measure
CompositeBuilt fromTested againstrVerdict
Underbody corrosionfrost days × salt load ÷ (distance to coast + 1)share of tests with a corrosion defect+0.42holds (116 areas)
Tyre wearrain days × annual miles ÷ age at first tyre advisoryshare of tests failing on tyres+0.45holds (116 areas)
Overnight corrosionterraced housing × cars per household × frost daysshare with a corrosion defect+0.41holds (102 areas) — and adds signal beyond the first index
Deferred maintenancedeprivation × advisory-to-failure conversion ÷ labour ratecars repeating the same advisory−0.26fails (118 areas)
Powertrain stressengine capacity ÷ kerb weightsuspension, brake and emissions failures−0.16fails (22 models)

The deprivation result is the one worth dwelling on. The intuition that poorer areas defer repairs is strong enough that most people treat it as established. We tested it twice — once on raw failure rates (r = 0.04) and again, more fairly, on whether an advisory turns into a failure — and it did not hold any of the three times we tried it — on raw failure rates, on advisory-to-failure conversion, and again with deprivation measured properly inside each nation rather than England alone. We are closing it. What does predict local failure rates is the density of test centres, which is a statement about testing, not about cars.

All external-factor correlations (machine-readable)
Factorrn areasLow-Q fail %High-Q fail %Gap ppLow-Q factorHigh-Q factor
MOT centre density (per 10k vehicles)0.58111425.932.2+6.358.7
Urban share (0–1)-0.38811431.926.9-5.00.41
Distance to coast (km)-0.35111431.828.7-3.15.979.5
Frost days (days/year)0.33511428.931.6+2.711.738.1
Road-salt proxy (g/m²-yr)0.30611428.331.4+3.1222.5675.1
Income deprivation (score)0.2709627.430.6+3.20.10.2
Terrain gradient (% grade)0.2496730.732.2+1.50.53.7

Deprivation uses England IMD 2019 income score only (Scotland SIMD is a different scale). Salt proxy is a simplified NWSRG-style dry-salt sum from air Tmin; coastalness is distance from the area centroid to the nearest coastline.

Every dot is a postcode area — size = how many were tested there, colour = share failing. These figures are not age-adjusted: coastal and rural areas often run older fleets and salted roads, so higher raw fail rates do not automatically mean a worse local stock of this model.

Map labels: Scotland · N. England · Wales · London · S. West. Colour scale: 25%–36% failing.

Kia Rio survival: which cars are still on the road

By age 19 is well below the reference at 2.9%, against 100.0% at the ages 4–6 reference level.

higher = larger sharecompare shares in percentage points

Kia Rio survival: which cars are still on the road — 2024 UK MOT data

Chart axes: car age, years · survival vs ages 4–6 · scale 0–105%.

Survival vs fail rate by age
AgeTestsSurvival vs ages 4–6Fail %
336,70973.6%9.19%
442,67685.6%14.14%
550,642100%18.14%
656,281100%20.89%
760,085100%24.63%
859,245100%28.51%
957,746100%32.5%
1052,413100%37.73%
1143,57287.4%40.52%
1234,76069.7%43.4%
1326,41353%45.26%
1419,53039.2%46.67%
1512,98626%48.38%
167,63715.3%50.09%
174,7489.5%49.79%
182,8465.7%50.25%
191,4692.9%49.01%

By age 19, only about 3% as many cars of this family present for MOT as at ages 4–6 (reference n≈49,866); survivors still fail at 49.0% vs 14.1% at age 4. Older cars that still appear are a selected subset — weaker ones have already left.

How many miles does a Kia Rio last?

100,000+ miles is highest at 10.1%; 200,000+ miles is lowest at 0.1% — the gap is 10.0 percentage points.

higher = larger sharecompare shares in percentage points

OdometerTests ≥ thresholdShare of sample
100,000+ miles57,83010.14%
150,000+ miles6,2491.1%
200,000+ miles6320.11%

Of 570,563 tests of this family with a usable odometer in 2024, 10.1% had reached 100k miles, 1.1% had reached 150k miles, 0.1% had reached 200k miles. This is a cross-section of cars still presenting for MOT, not a full birth cohort.

How many years is a Kia Rio likely to last?

Bought at age 5 is highest at 8.6 years; Bought at age 15 is lowest at 1.8 years — the gap is 6.8 years.

bigger number = longer remaining lifeyears on the observed survival curve

Age nowTypical mileage (p50)Expected years left
5—8.6
8—5.6
10—3.6
12—2.7
15—at least 1.8

estimateEstimate only — not a warranty: a typical 10-year-old example of this family has about 3.6 expected years of further MOT-present life on the 2024 survival curve. Derived from how many cars of each age still appear for test, not from a longitudinal panel.

Kia Rio faults that come together

Road Wheels + Seatbelts & SRS stand out at 6.28×, against 1.00× if the faults were independent.

above 1.0× = more than expectedbelow 1.0× = less

Group AGroup BTogetherLift
Road WheelsSeat belts and supplementary restraint systems446.28× (rough estimate)
Noise, emissions and leaksRoad Wheels866.25× (rough estimate)
Noise, emissions and leaksSeat belts and supplementary restraint systems5165.85×
Body, chassis, structureIdentification of the vehicle2515.83× (rough estimate)
Identification of the vehicleSeat belts and supplementary restraint systems815.7× (rough estimate)
Body, chassis, structureNoise, emissions and leaks1,4975.6×
Identification of the vehicleNoise, emissions and leaks1425.09× (rough estimate)
BrakesIdentification of the vehicle5704.75×
Identification of the vehicleLamps, reflectors and electrical equipment7164.14×
Body, chassis, structureSteering3,0824.06×
Identification of the vehicleSteering3214.05× (rough estimate)
Lamps, reflectors and electrical equipmentSeat belts and supplementary restraint systems2,1423.92×
BrakesNoise, emissions and leaks2,8563.84×
Lamps, reflectors and electrical equipmentRoad Wheels3223.78× (rough estimate)
Identification of the vehicleVisibility4663.7× (rough estimate)
Body, chassis, structureBrakes4,2423.69×
Road WheelsTyres1943.68× (rough estimate)
Lamps, reflectors and electrical equipmentNoise, emissions and leaks3,8743.61×
Body, chassis, structureRoad Wheels753.53× (rough estimate)
Body, chassis, structureLamps, reflectors and electrical equipment5,7883.5×
Identification of the vehicleTyres3723.48× (rough estimate)
BrakesSeat belts and supplementary restraint systems1,3093.46×
Identification of the vehicleSuspension5483.46×
BrakesRoad Wheels2013.4× (rough estimate)
Body, chassis, structureSuspension5,0743.35×
Body, chassis, structureSeat belts and supplementary restraint systems4423.25× (rough estimate)
Seat belts and supplementary restraint systemsSuspension1,5873.18×
Noise, emissions and leaksSuspension3,0703.13×
BrakesLamps, reflectors and electrical equipment14,0833.06×
Lamps, reflectors and electrical equipmentSteering9,1843.02×
BrakesSteering6,2232.95×
BrakesSuspension12,3662.93×
Lamps, reflectors and electrical equipmentSuspension17,7652.92×
SteeringSuspension8,1372.92×
Road WheelsSuspension2272.91× (rough estimate)
Seat belts and supplementary restraint systemsVisibility1,1322.85×
Noise, emissions and leaksTyres1,8682.82×
BrakesTyres7,9952.81×
Road WheelsVisibility1702.74× (rough estimate)
Noise, emissions and leaksVisibility2,0942.68×
Lamps, reflectors and electrical equipmentVisibility12,8392.65×
BrakesVisibility8,5032.54×
Body, chassis, structureVisibility3,0672.54×
Lamps, reflectors and electrical equipmentTyres10,4062.53×
Seat belts and supplementary restraint systemsTyres8422.5×
TyresVisibility7,3982.48×
Noise, emissions and leaksSteering1,2042.45×
Road WheelsSteering952.43× (rough estimate)
Body, chassis, structureTyres2,4572.4×
SteeringVisibility5,1442.32×
SteeringTyres4,2232.24×
SuspensionTyres8,0952.15×
SuspensionVisibility9,4862.14×
Seat belts and supplementary restraint systemsSteering4771.91× (rough estimate)
Identification of the vehicleRoad Wheels13too few (rough estimate)
Lamps, reflectors and electrical equipmentSeat belt installation check9too few (rough estimate)
Seat belt installation checkSuspension8too few (rough estimate)
BrakesSeat belt installation check7too few (rough estimate)
Seat belt installation checkVisibility7too few (rough estimate)
Body, chassis, structureSeat belt installation check5too few (rough estimate)

Defects in «Noise, emissions and leaks» and «Seat belts and supplementary restraint systems» appear together 5.85× more often than chance (516 co-occurrences in the same test; lift≥1.3, n≥500).

Lift = how many times more often both groups appear on the same test than if independent. A pair is listed from 5 tests with both faults; the lift is shown from 20, and called above chance only when its 95% interval excludes 1 (see rough estimates).

Is low mileage better for a Kia Rio?

Cars driven under 5,000 miles a year is well below the reference at 21.4%, against 38.0% for cars driven 8,000–12,000 miles a year.

higher = larger sharecompare shares in percentage points

BandFail %Tests
<5k miles/year21.42%129,352
8–12k miles/year37.95%119,374
Gap (low − normal)-16.54 pp—
By fuel and age

Diesel

AgeLow-use fail %nNormal fail %nGap pp
515.9298624.743,104-8.82 pp
615.691,27529.014,385-13.32 pp
719.871,54033.145,540-13.27 pp
820.841,61738.085,627-17.24 pp
924.741,83542.115,928-17.36 pp
1027.371,92247.375,675-20 pp
1132.071,87448.354,976-16.28 pp
1235.011,80552.533,960-17.51 pp
1336.471,75553.712,854-17.25 pp
1438.621,55155.452,000-16.83 pp

Petrol

AgeLow-use fail %nNormal fail %nGap pp
511.6913,82721.759,682-10.06 pp
613.1414,28125.0210,524-11.88 pp
714.9114,21530.3310,963-15.42 pp
817.9113,96835.2410,646-17.34 pp
920.8113,20139.359,850-18.54 pp
1025.6212,05944.558,559-18.93 pp
1129.610,17646.016,486-16.41 pp
1232.148,65149.774,515-17.63 pp
1335.077,16353.092,639-18.02 pp
1437.215,65155.561,456-18.35 pp

At matched ages 5–14, cars averaging under 5k miles/year fail at 21.4% vs 38.0% for 8–12k miles/year — 16.5 pp lower (n_low=129,352, n_normal=119,374). In this family low annual use is associated with fewer MOT fails, not more — the ‘garage queen’ penalty is not visible in overall fail rates. Diesel alone: 27.6% low-use vs 43.8% normal (-16.3 pp).

Which Kia Rio engine is best?

diesel 1.0–1.2 is highest at 124.3; petrol under 1.0 is lowest at 76.7 — the gap is 47.6 points.

below 100 is betterabove 100 is worse100 = normal for this model at that age

Engine bands against this model's own failure rate at the same ages
FuelCapacityvs own age normRaw fail %Tests
petrolunder 1.0 litre76.711.37%25,758
petrol1.0–1.2 litre93.522.79%200,578
petrol1.2–1.5 litre96.533.52%209,163
petrol1.5–1.8 litre108.844.46%596 (rough estimate)
diesel1.2–1.5 litre111.838.59%94,394
diesel1.0–1.2 litre124.335.2%39,993

Splitting this model by fuel alone hides the thing that actually differs. Within the same badge, the diesel 1.0–1.2 runs at 124.3 against this model's own age norm while the petrol under 1.0 runs at 76.7 — a spread of 47.6 points between two cars that share a name.

Read this one with more care than the rest of the page. Age is held constant, but who buys which engine is not: the largest capacity in a range is often a performance or executive variant that is garaged, cherished and lightly driven, while the smallest is frequently a fleet or entry car worked hard from new. The gap below is real in the test records; how much of it is the engine and how much is the owner, this data cannot separate. Bands under 100 tests are not shown; bands under 5,000 tests are rough estimates.

Best year for a Kia Rio, and the years to avoid

Build year 2013 is highest at 107.8; Build year 2017 is lowest at 82.9 — the gap is 24.9 points.

below 100 is betterabove 100 is worse100 = normal for this model at that age

build year vs the same model at the same age · 100 = as expected

Kia Rio build year vs the same model at the same age · 100 = as expected — 2024 UK MOT data
Kia Rio by build year, tests 2019–2024. Below 100 is better than the model's own age norm.
Every build year with its confidence interval
Build yearvs own age norm95% CIRaw fail %TestsVerdict
202098.291.2–105.211.09%6,764no different
201988.784.5–92.911.85%14,644better
201883.280.1–86.212.6%23,017better
201782.980.7–8513.84%42,255better
201696.394.3–98.218.25%53,554better
201588.787.3–90.220.29%68,841better
2014101.399.8–102.727.11%67,438no different
2013107.8106.3–109.332.8%61,758worse
2012105.9104.4–107.336.15%56,743worse
2011106.8105.2–108.440.09%44,891worse
2010102100.5–103.541.37%41,708worse
2009100.298.6–101.843.36%34,765no different
2008104.7102.4–10747.45%16,544worse
2007103.6100.8–106.448.71%10,651worse
2006102.999.9–105.849.68%9,424no different
2005102.698.9–106.250.58%6,028no different
2004101.296.7–105.751.16%3,833no different
2003101.995.9–107.852.36%2,141no different
200292.883.9–101.647.95%880no different

The best build year here is 2017 and the weakest is 2013. Comparing build years sounds simple and is not: within a single year of testing, a car's build year and its age are the same number, so a naive comparison of years is a comparison of ages wearing a disguise. Each year below is measured against the same model at the same age in other cohorts, across six years of testing — 11 of 19 years come out distinguishable from their own model's age norm.

Two limits worth knowing before you act on this. Age, test year and build year are locked together by arithmetic, so the test-year effect is taken from the observed national failure level of each year rather than estimated — it is an adjustment, not a solution.

Kia Rio MOT repair costs

The MOT-failure repair budget per test runs from £74.20 to £140.98, against £54.85 for the test itself.

bigger number = costs morepounds per test, MOT-failing faults only

MOT repairs, budget
£74–141
per test, repairs only
The test itself
£54.85
statutory cap, unchanged since 2010
How the figure is built: chance of failing × typical price of that repair
ComponentFails per 100 testsTypical repairIts priceContribution
Suspension14.1 (nat. 15.36)Suspension coil spring (single corner)£180£25.38
Lamps, reflectors and electrical equipment15.2 (nat. 18.09)Battery replacement (standard 12V lead-acid)£140£21.28
Brakes12.9 (nat. 11.25)Front brake pads (parts + labour, typical hatchback)£150£19.35
Tyres9.1 (nat. 8.7)Tyre (single mid-range 16" fitted)£90£8.19

Multiply how often each component fails on this model by what that repair usually costs, and you get the amount an owner should expect to budget per test for MOT-failing faults only — roughly £74 to £141, on top of the test fee itself. It is a budgeting figure, not a quote: the spread between a set of pads and a set of discs is most of the range.

Prices are modal quotes from a hand-kept catalogue of published UK garage guides — we do not scrape the booking sites, their terms forbid it, so this list is short and updated by hand with a source and date against each line. Each line prices one typical repair in that group, not a full remedy, and only groups our catalogue actually covers are counted. The contrast worth noticing is the second card: the legal maximum for the test has been £54.85 since 2010, while the repairs it uncovers have followed inflation the whole time.

For scale from a different direction: Warrantywise, which sees used-car warranty claims rather than test failures, puts the average claim at £2,052 across the ten highest-claim models it ranks and £539 for Honda, the lowest-claim make in its index (Warrantywise index 2026, 1.6 million claims, cars aged 3–15). Those sit an order of magnitude above the figures in this table, and the gap is the point: a warranty claim is a gearbox or an engine, which almost never fails an MOT, while the faults that do fail one are corrosion, lamps and tyres, which no warranty pays for. The two numbers answer different questions and neither replaces the other.

Kia Rio running costs for a fleet

Vehicles failing at age 10 stand out at 33.0%, against 16.0% at age 5, tested in the same year.

higher = larger sharecompare shares in percentage points

Fails per 100 at age 5
16
vehicles needing work
At age 10
33
other cars of this model tested at age 10 in 2024
Repairs per 100
£7,420
plus £5,485 in test fees
Off the road
1d
median; 47.48% cleared same day
Failure rate and typical odometer by age
AgeFailsMedian odometerTestsGap vs age 5
38.05%18,6503,689-7.8 pp
413.85%23,6213,373-2.0 pp
515.83%29,8644,872+0.0 pp
615.63%37,4055,721-0.2 pp
717.6%45,2408,076+1.8 pp
822.45%49,0438,807+6.6 pp
924.02%56,45511,360+8.2 pp
1033.33%65,98811,047+17.5 pp
1138.18%73,7849,921+22.4 pp
1241.26%81,4398,970+25.4 pp
1345.3%78,8366,805+29.5 pp
1444.84%81,6786,028+29.0 pp
1545.77%79,5384,680+29.9 pp
1650.74%87,1642,018+34.9 pp
1751.25%89,2571,159+35.4 pp
1850.49%88,067911+34.7 pp
1949.09%78,401493+33.3 pp

The number a fleet manager needs is not the failure rate, it is the year the car starts costing more. Between cars aged 9 and cars aged 10, both tested in 2024, the failure rate of this model is 9.31 percentage points higher — the steepest one-year step in this cross-section of different cars, and a natural planning point for replacement.

Repair spend uses the same modal prices as the section above, so it inherits the same limits: one typical repair per component group, not a full remedy. Downtime is the gap between the failed test and the passed re-test, which is the window a vehicle is legally off the road.

Kia Rio rust problems: where they corrode

Age-standardised corrosion susceptibility stands out at 2.48×, against 1.00× for the national age-standardised rate.

above 1.0× = rusts more than averagebelow 1.0× = rusts less

How it rusts
2.48×
1.9% of tests record a corrosion defect vs 0.77% typical — age-standardised
Salt Belt exposure
83rd
percentile among the models published here, from its tests across 114 postcode areas

This Kia Rio fails on corrosion far more often than average once age is held constant, and its owners live in areas that are saltier than most for the models we publish.

Corrosion is the one failure mode that is as much about geography as about the car. We keep the two apart on purpose: a model can look rusty simply because it is popular in Scotland, and a model can look clean simply because it is bought in Surrey. Blending them into a single score would hide which of the two is doing the work.

Exposure is this model's tests weighted by an area corrosion index built from frost days, salt load and distance to the coast — the composite validated at r = 0.42 against corrosion defects we actually record. It is published as a rank, not a raw score, because every mainstream model skews towards low-corrosion areas for the simple reason that most of Britain's cars are in the south. Susceptibility is standardised to the national age profile, so an old fleet does not get labelled a rusty model.

Does a Kia Rio advisory become a failure?

Lamps, reflectors and electrical equipment are highest at 27.0%; Road wheels are lowest at 0.6% — the gap is 26.4 percentage points.

higher = more likelypercentage is the observed transition probability

chance the same component fails at the next MOT, given an advisory now

Kia Rio chance the same component fails at the next MOT, given an advisory now — 2024 UK MOT data
Kia Rio, advisory → failure conversion by component group, chained tests 2019–2024. Chart labels and rates: Lamps & electrical 27% · Steering 22.8% · Suspension 22.5% · Brakes 13.9% · Body & chassis 10.3% · Tyres 10.1% · Noise, emissions, leaks 5.6% · Seat belts & restraints 4.4%.
Advisory today → failure at the next test, with how long you have
ComponentFails next timeTypical lead timeMiles of warningAdvisories tracked
Lamps, reflectors and electrical equipment27.0%12 months5,5985,546
Steering22.8%12 months4,96013,631
Suspension22.5%12 months5,25746,902
Brakes13.9%12 months5,21796,753
Body, chassis, structure10.3%12 months4,83711,090
Tyres10.1%12 months5,933113,163
Noise, emissions and leaks5.6%12 months5,47411,683
Seat belts and supplementary restraint systems4.4%12 months5,7221,756
Identification of the vehicle3.7%12 months5,7059,574
Road wheels0.6%12 months5,2662,400

This is the question an advisory note actually raises, and it needs six years of test history to answer. We followed the same vehicles from one MOT to the next across 2019–2024 and measured how often a component that was merely advised came back as a genuine failure at the next test.

Read it as a budgeting horizon, not a prophecy: the most likely component above turns into a failure for about 27 in 100 cars, and the median gap is 12 months and roughly 5,598 miles. The rest were repaired, sold, scrapped, or simply held. Rows with fewer than 500 tracked advisories are not shown.

What will fail next on a Kia Rio?

Lamps, reflectors and electrical equipment after a failure at age 15-19 are highest at 30.6%; Brakes after a passed at age <3 are lowest at 1.5% — the gap is 29.1 percentage points.

higher = more likelypercentage is the observed transition probability

Probability of each component failing at the next test, by age and last result
AgeLast testMost likely next failuresCars tracked
<3passedVisibility 5.3% · Tyres 3.2% · Brakes 1.5%19,414
<3advisoryVisibility 7.6% · Tyres 6.2% · Brakes 3.0%4,428
<3failureVisibility 8.3% · Tyres 7.0% · Brakes 2.9%2,203
3-5passedVisibility 5.8% · Tyres 4.1% · Lamps, reflectors and electrical equipment 2.8%70,399
3-5advisoryVisibility 8.4% · Tyres 7.0% · Brakes 5.0%32,810
3-5failureVisibility 8.3% · Tyres 8.1% · Lamps, reflectors and electrical equipment 6.3%21,141
6-8passedSuspension 9.0% · Lamps, reflectors and electrical equipment 8.1% · Visibility 5.3%62,730
6-8advisorySuspension 12.0% · Lamps, reflectors and electrical equipment 11.0% · Tyres 8.2%43,570
6-8failureLamps, reflectors and electrical equipment 14.9% · Suspension 13.8% · Brakes 10.2%40,837
9-11passedLamps, reflectors and electrical equipment 12.7% · Suspension 12.4% · Brakes 7.0%32,658
9-11advisorySuspension 17.4% · Lamps, reflectors and electrical equipment 17.2% · Brakes 10.9%31,680
9-11failureLamps, reflectors and electrical equipment 21.5% · Suspension 18.8% · Brakes 14.0%41,764
12-14passedLamps, reflectors and electrical equipment 14.2% · Suspension 12.7% · Steering 10.8%10,271
12-14advisoryLamps, reflectors and electrical equipment 20.2% · Suspension 18.4% · Steering 15.5%14,130
12-14failureLamps, reflectors and electrical equipment 25.0% · Suspension 22.7% · Brakes 17.1%20,094
15-19passedSuspension 16.6% · Lamps, reflectors and electrical equipment 15.7% · Brakes 12.4%2,613
15-19advisoryLamps, reflectors and electrical equipment 22.6% · Suspension 21.7% · Brakes 15.8%4,031
15-19failureLamps, reflectors and electrical equipment 30.6% · Suspension 27.1% · Brakes 20.5%6,068
20+passedSuspension 19.3% · Body, chassis, structure 17.5% · Brakes 12.3%57 (rough estimate)
20+advisoryBody, chassis, structure 23.7% · Suspension 22.7% · Lamps, reflectors and electrical equipment 20.6%97 (rough estimate)
20+failureSuspension 25.0% · Lamps, reflectors and electrical equipment 24.2% · Body, chassis, structure 23.5%132 (rough estimate)

The same chains, cut differently: given a car's age and how its last test went, which component most often causes trouble at the following one.

The pattern that repeats across every family: a failure at one test roughly doubles the chance of a failure on the same component at the next one, and an advisory sits about half-way between a clean pass and a failure. Age bands in years; probabilities are per car, not per defect item.

Kia Rio ownership: what six years of MOTs show

The ten-day re-test pass rate is highest at 50.2%; The later re-test pass rate is lowest at 2.3% — the gap is 47.9 percentage points.

higher = larger sharecompare shares in percentage points

Fixed same day
47.48%
of failures re-tested
Fails /10k miles
0.528
miles actually driven
Clean streaks
37.86%
3+ tests, nothing noted
Odometer anomaly
0.616%
reading went backwards

Failing is usually a same-week event, not a disaster. Of 125,604 failures followed through to their re-test, 47.48% were repaired and passed the same day and 50.21% within ten days; the median gap is 1 day. 304,303 defect items were cleared in the process.

Per mile driven, not per year. Dividing failures by the miles that actually went onto the odometers between consecutive tests gives 0.528 failures per 10,000 miles, on a median of 4,928 miles a year across 106,411 chains. This is the number to compare between models — an annual rate quietly rewards cars that barely leave the drive.

Two populations hide inside one model. 37.86% of these cars strung together three or more tests with nothing recorded at all, while 33.67% carried the same advisory three times or more — the same fault, noted, ignored, noted again. When you buy used you are buying one of those two histories, and the MOT record shows which.

Odometer anomalies: 0.616% of 106,437 chains show a reading lower than the previous test, with a median drop of 9,071 miles. We call this an anomaly and not fraud on purpose — instrument swaps, imports, unit mix-ups and keying errors all land in the same bucket. Obvious typos (drops under 100 miles or over 90% of the reading) are already excluded.

Kia Rio safety recalls and how to check yours

DVSA recall campaigns stand out at 6.

bigger number = more recorded casescompare like-for-like scope, not sample size alone

recall campaigns launched per year

Kia Rio recall campaigns launched per year — 2024 UK MOT data
Campaigns launched per year for the Kia Rio. Source: DVSA vehicle safety recalls. Chart values: 2010: 0 · 2011: 0 · 2012: 0 · 2013: 0 · 2014: 0 · 2015: 0 · 2016: 0 · 2017: 0 · 2018: 1 · 2019: 0 · 2020: 0 · 2021: 0 · 2022: 0 · 2023: 0 · 2024: 3.
Most recent safety recall campaigns for the Kia Rio
ReferenceLaunchedVehiclesConcern
R/2024/46505/12/20242Kia HECU Fuse Replacement
R/2024/46505/12/20246,961Kia HECU Fuse Replacement
R/2024/46505/12/202459,379Kia HECU Fuse Replacement
R/2018/12011/05/20182,300CHILD LOCKS ON THE REAR DOORS MAY NOT OPERATE
R/2004/10916/08/200417,764POTENTIAL FUEL LEAK
All 6 campaigns
ReferenceLaunchedBuild datesVehiclesConcern
R/2024/46505/12/202428/10/2009 – 26/09/20112Kia HECU Fuse Replacement
R/2024/46505/12/202428/10/2009 – 26/09/20116,961Kia HECU Fuse Replacement
R/2024/46505/12/202415/12/2010 – 31/03/201759,379Kia HECU Fuse Replacement
R/2018/12011/05/201810/04/2017 – 05/06/20172,300CHILD LOCKS ON THE REAR DOORS MAY NOT OPERATE
R/2004/10916/08/200404/05/2000 – 31/03/200417,764POTENTIAL FUEL LEAK
R/2003/16210/11/200327/11/2002 – 19/03/20032,638REPROGRAMMING OF ABS ECM

DVSA lists 6 safety recall campaigns for the Kia Rio, covering roughly 89,044 vehicles in total. A recall is the manufacturer fixing a fault for free, so an open recall on your car costs nothing to clear.

Counter-intuitive, and measured on our own data: across the 25 families published here, more recalls go with a lower MOT Risk Index (r = −0.52). Heavily recalled models are not worse cars in the test bay — an active manufacturer removes the fault before it becomes an MOT failure.

Check whether a specific car has an outstanding recall — free, by registration — at DVSA's recall service. Source: DVSA vehicle safety recalls (check-vehicle-recalls.service.gov.uk), OGL.

Kia Rio technical service bulletins: what dealers are told

US market, Kia RIO and its variants, model years 2015–2022 only. A count of bulletins, not a UK failure rate.

NHTSA manufacturer communications are 165.

bigger number = more recorded dealer communicationsnot affected vehicles or confirmed faults

These are the issues the manufacturer fixes quietly: service communications sent to dealers without a public recall campaign. They show what the service network has been told even when the issue never became news.

United States · NHTSA manufacturer communications

US technical service bulletins by communication year; leading subjects cover the full file
Communication yearBulletinsLeading subjects across all years
20131
  • Electrical system (72)
  • Equipment (33)
  • Engine and cooling (31)
  • Structure (22)
  • Powertrain (17)
  • Steering (13)
  • Engine (9)
  • Adaptive and mobility equipment (8)
20145
201517
20167
201713
201814
201912
202014
202119
20228
202333
20249
20259
20264

Caveat worth stating plainly: this is NHTSA data about US-specification cars. British cars sold under the same name often use different gearboxes, engines and equipment, so a bulletin may describe a component that was never fitted here. The file counts dealer communications, not affected vehicles or confirmed failures, and it cannot tell you whether an individual UK car has the issue. A communication can carry more than one subject tag, so topic counts do not have to add up to the total. Source: NHTSA Manufacturer Communications API (US-market vehicles; queried model years 2015-2022). Licence: U.S. Government work / public domain · retrieved 2026-09-25.

Kia Rio owner complaints: what goes wrong

US market, Kia RIO and its variants, model years 2015–2022 only. A count of owner complaints, not a UK failure rate; NHTSA has no UK denominator.

Engine (not MOT-tested) is highest at 109; Steering is lowest at 17 — the gap is 92.

bigger number = more recorded casescompare like-for-like scope, not sample size alone

Owner complaints (US) against actual MOT failures (UK) for the same component groups
ComponentComplaintsShareMOT fail items per 100MOT rankAgreement
Engine (not MOT-tested)10941.6%not in top 6—complained about, rarely an MOT failure
Brakes4717.9%12.9#3complained about and fails often
Lamps & electrical4115.6%15.2#1complained about and fails often
Restraints2710.3%not in top 6—complained about, rarely an MOT failure
Steering176.5%6.1#6complained about, fails occasionally
Transmission (not MOT-tested)176.5%not in top 6—complained about, rarely an MOT failure

Two different populations answering two different questions: the MOT records what an inspector can measure once a year, the complaint file records what annoyed or frightened an owner on the road. A component high in one column and absent from the other is the interesting case — driver-assistance and electronics dominate complaints while almost never appearing as an MOT failure item.

What the reports actually say
Engine making noise and smelling like it’s burning. Towed to mechanic said oil was not there despite recent oil change and said sparks of metal was on oil dipstick. Now being told needs new engine after recall oiece completed and the car has less than 110k miles. Kia will not honor an engine replacement.
NHTSA complaint, filed 07/10/2024 · ENGINE
The contact owns a 2015 Kia Rio. The contact stated that while driving at an undisclosed speed, the check engine warning light was illuminated. The vehicle was taken to an independent mechanic, who diagnosed a failure with the catalytic converter. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 53,000.
NHTSA complaint, filed 10/12/2023 · ENGINE AND ENGINE COOLING

US owners have filed 262 complaints about the equivalent Kia Rio to the National Highway Traffic Safety Administration, including 28 that mention a crash, 29 a fire and 27 an injury. These are owner reports, not verified findings — but they are the only large public record of what drivers themselves notice, and they cover the years between MOT tests.

Caveat worth stating plainly: US-specification cars, self-selected reporters, no denominator — complaint counts scale with how many cars were sold there and how motivated owners are to file. The mechanical gap matters as much as the statistical one: American cars of the same name often carry different gearboxes, engines and equipment — automatics where Britain buys manuals — so a drivetrain complaint filed in Ohio may describe a part that was never fitted here. Read the ranking inside a model, not between models, and treat drivetrain entries with particular caution. Source: NHTSA ODI consumer complaints (US market, public domain) — US-spec vehicles, indicative only.

Kia Rio inspection results in other countries

Finland Katsastus is well below the reference at 16.3%, against 26.3% nationally.

higher = larger sharecompare shares in percentage points

Same model, different national inspection regimes
CountryTestThis model failsNational averagePositionSample
United KingdomMOT (class 4)30.68%26.01%+4.7 pp98,818
NetherlandsAPK51.7%50.8%+0.9 pp32,954
FinlandKatsastus16.3%26.3%-10 pp12,684
NorwayPKK32.8%33.7%-0.9 pp2,249

The countries disagree about this car, and that is worth saying out loud rather than averaging away. A model can sit above its national average in one country and below it in another because the fleets are not the same cars: different model years, different engines, different roads and salt, and inspection rules that weight components differently. Treat each row as evidence from one regime, not as a verdict.

What Finland fails it for — share of recorded faults
Fault areaShare
Brake systems51.1%
Axles, wheels and suspension28.6%
Environmental hazards7.5%
Steering equipment4.5%
Chassis and body2.2%

Useful as a cross-check on the UK defect table above: the categories are named differently, but a component that dominates in both regimes is a genuine weak point of the model rather than an artefact of one country's testing style.

The exact faults Netherlands records — APK defect codes, 2024
CodeFaultRecordedType
210Tyre pressure not at the correct value7,049failure
205Tyre with insufficient tread4,747failure
AC1Tyre down to 1.6–2.5 mm of tread2,615advisory
497Number-plate light not working or missing2,611failure
516Dipped headlight incorrectly aimed2,517failure
391Wipers leave insufficient visibility1,671failure
203Tyre damaged1,545failure
RA1Airbag or seat-belt warning light showing a fault1,541advisory

Worth dwelling on how mundane the top of that list is: tyre pressure, tread depth, headlight aim. The Dutch APK records 1.254 defects per inspection against a much higher national failure rate than Britain's, and the reason is not that Dutch cars are worse — it is that the two regimes draw the line between "note it" and "fail it" in different places. Codes are the RDW's own; the English wording here is our translation of the Dutch original.

Britain is not the only country that inspects every car every year, and the Kia Rio is on the road in all of them. Each national regime writes its own rules, so the pass rates below are not comparable to each other — what does travel across a border is whether a model sits above or below its own country's average.

Rows with fewer than 500 inspections are not published. Sources: RDW open data — Meldingen Keuringsinstantie + Geconstateerde Gebreken + Gekentekende voertuigen (2024), CC0. Not an RDW endorsement.; Traficom — Periodic inspections of cars by model / by model and fault object 2024, CC BY 4.0; Statens vegvesen — Periodisk kjøretøykontroll (PKK) 2024, CC BY 4.0. Adapted; licences and full notice.

Kia Rio MOT: quick answers

Kia Rio MOT Risk Index stands out at 106.8, against 100 for a car with the same age profile.

below 100 is betterabove 100 is worse100 = normal for this model at that age

What is the Kia Rio first-time MOT pass rate?
69.32% of first attempts passed in 2024 (98,818 tests). This is the first-time figure: retests after repair are excluded. Basis: first-time, excluding retests.
Why does this number differ from other sites?
Other sites often report a pass rate that includes retests or counts all attempts. Our 30.68% figure is the first-time initial failure rate, using 98,818 primary tests as the denominator (first-time, excluding retests). The age-adjusted MOT initial-failure ratio 106.8 is shown separately because raw rates compare fleet age as well as cars.

Compare the Kia Rio with other cars

Volvo V40 is highest at 108.1; Volkswagen Transporter is lowest at 105.7 — the gap is 2.4 points.

below 100 is betterabove 100 is worse100 = normal for this model at that age

Same brand

All Kia MOT statisticsKia Sportage MOT statsKia Picanto MOT stats

Similar risk

Nissan Micra (index 106.0)Volkswagen Transporter (index 105.7)Volvo V40 (index 108.1)

Same size class

how Volvo V40 compareshow Jaguar XF compareshow Ford EcoSport compares

By build year

Kia Rio 2002Kia Rio 2003Kia Rio 2004Kia Rio 2005Kia Rio 2006Kia Rio 2007Kia Rio 2008Kia Rio 2009Kia Rio 2010Kia Rio 2011Kia Rio 2012Kia Rio 2013Kia Rio 2014Kia Rio 2015Kia Rio 2016Kia Rio 2017Kia Rio 2018Kia Rio 2019Kia Rio 2020

By area

Kia Rio MOT failure rate by postcode area

By failure group

Kia Rio body, chassis and structure failuresKia Rio brakes failuresKia Rio vehicle identification failuresKia Rio lamps, reflectors and electrics failuresKia Rio noise, emissions and leaks failuresKia Rio road wheels failuresKia Rio seat belts and airbags failuresKia Rio steering failuresKia Rio suspension failuresKia Rio tyres failuresKia Rio visibility failures

Inspections abroad

Kia Rio in NorwayKia Rio in FinlandKia Rio in the Netherlands


Data details & how to cite

Scope: class-4 vehicles (cars), initial tests only, outcomes pass / fail / fixed-on-the-spot at the station (PRS counts towards the failure rate — the defect was present at arrival). Index = observed initial failures ÷ failures expected for this fleet's exact age profile, ×100; margin of error is a 95% confidence interval. Covers ALL generations together — a 3-year-old and a 15-year-old are very different cars; a generation split is on the roadmap. Dataset release dataset_release_id=dvsa-2024-v2, frozen baseline; headline claim_id=family-stats:kia-rio:dvsa-2024-v2. Full method: methodology.

Cite: MOT Risk Index (2026). Kia Rio MOT statistics 2024 (data release dvsa-2024-v2; downloadable dataset motriskindex-families-2024-v5, doi:10.5281/zenodo.22975051). https://motriskindex.co.uk/cars/kia-rio/ · Published 2026-07-30.