Mazda Demio — MOT statistics 2024

The Mazda Demio failed 38.31% of 616 first MOT attempts in 2024 ("first-time", excluding retests). Adjusted for the age of the fleet, its initial-failure ratio is 97.2 (100 = expected for its age profile). This car is too close to call — statistically indistinguishable from normal for its age. Small sample — treat with care.

Age-adjusted peer: Hyundai Tucson (index 97.3) — the two published results are 0.1 index points apart.

Mazda Demio common problems: what actually fails the MOT

Body, chassis, structure stand out at 37.3 per 100 tests, against 16.1 per 100 tests across UK vehicles of the same ages.

higher bar = fails more oftenrate per 100 tests

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.

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

Mazda Demio MOT advisories: what gets flagged

Suspension is highest at 64.1 per 100 tests; Emissions & leaks are lowest at 7.9 per 100 tests — the gap is 56.2 per 100 tests.

higher bar = flagged more oftenadvisory items per 100 initial tests

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

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.

A failed test does not clearly change next year's odds here (40.4% against 37.0%): the difference is within the margin of error. The failure most likely to come back is visibility — 43.9% 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 6,833 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.

Split by how much each car is driven. This is a split by annual mileage, not by body type — the MOT record does not say whether a car is a conversion. Within each band the index compares with vehicles of the same age driven as much.

Mileage matters here: matching on how much these are driven moves the figure by 8.9 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 Mazda Demio 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.

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 Mazda Demio perform as it gets older?

The Demio at age 20 is close to the reference at 40.5%, against 41.0% for all vehicles of the same age.

higher = larger sharecompare shares in percentage points

Chart axes: car age, years · failure-rate scale 0–47%.

Takeaway: solid line: this family; dashed: all cars.

How dangerous are Mazda Demio MOT failures?

Major defects stand out at 118.4 per 100 tests, against 52.8 per 100 tests nationally.

higher bar = fails more oftenrate per 100 tests

Chart values: Minor 44.3 · Major 118.4 · Dangerous 14.9.

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

Does the month of a Mazda Demio MOT matter?

Feb is highest at 51.0%; Dec is lowest at 40.4% — the gap is 10.6 percentage points.

higher = larger sharecompare shares in percentage points

Chart scale: 27%–53%.

bars: Mazda Demio · dashed: all class-4 cars

Takeaway: the spread between best and worst month is 10.6 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.

Mazda Demio average mileage by age

At age 20+, the middle half of Demios runs from 51,616 miles to 89,765 miles, against 70,635 miles as the median.

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

Does high mileage mean more Mazda Demio MOT failures at the same age?

Within the same age group, split by odometer (2024 MOTs), so this separates wear from age: at ages 15+, 22.7% of those with under 40,000 miles failed first time versus 46.8% of those with 100,000–140,000 miles.Inside this age group, higher mileage goes with more failures.

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

A typical 20+-year-old Demio has ~70,635 miles on the clock. Much more — ask why; much less — check for gaps in the MOT history.

Where in Britain the Mazda Demio fails its MOT most

Bath area is highest at 65.2%; London SE area is lowest at 27.1% — the gap is 38.1 percentage points.

higher = larger sharecompare shares in percentage points

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.

How many miles does a Mazda Demio last?

100,000+ miles stands out at 18.9%.

higher = larger sharecompare shares in percentage points

Of 6,912 tests of this family with a usable odometer in 2024, 18.9% had reached 100k miles. This is a cross-section of cars still presenting for MOT, not a full birth cohort.

Mazda Demio faults that come together

Emissions & leaks + Seatbelts & SRS stand out at 3.44×, against 1.00× if the faults were independent.

above 1.0× = more than expectedbelow 1.0× = less

Defects in «Lamps, reflectors and electrical equipment» and «Suspension» appear together 1.87× more often than chance (593 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).

Mazda Demio MOT repair costs

The MOT-failure repair budget per test runs from £168.04 to £319.28, against £54.85 for the test itself.

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

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 £168 to £319, 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.

Mazda Demio rust problems: where they corrode

Age-standardised corrosion susceptibility is well below the reference at 0.39×, against 1.00× for the national age-standardised rate.

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

This Mazda Demio fails on corrosion much less often than average once age is held constant, and its owners live in areas that are gentler 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 Mazda Demio advisory become a failure?

Suspension is highest at 35.3%; Tyres are lowest at 12.8% — the gap is 22.5 percentage points.

higher = more likelypercentage is the observed transition probability

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

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 35 in 100 cars, and the median gap is 12 months and roughly 2,392 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 Mazda Demio?

Suspension after a failure at age 20+ is highest at 34.0%; Lamps, reflectors and electrical equipment after a passed at age 20+ are lowest at 8.5% — the gap is 25.5 percentage points.

higher = more likelypercentage is the observed transition probability

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.

Mazda Demio ownership: what six years of MOTs show

The ten-day re-test pass rate is highest at 64.5%; The later re-test pass rate is lowest at 6.5% — the gap is 58.0 percentage points.

higher = larger sharecompare shares in percentage points

Failing is usually a same-week event, not a disaster. Of 2,094 failures followed through to their re-test, 28.94% were repaired and passed the same day and 64.52% within ten days; the median gap is 2 days. 6,028 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 1.234 failures per 10,000 miles, on a median of 2,254 miles a year across 1,526 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. 22.19% of these cars strung together three or more tests with nothing recorded at all, while 40.59% 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: 1.829% of 1,531 chains show a reading lower than the previous test, with a median drop of 32,177 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.

Mazda Demio safety recalls and how to check yours

DVSA recall campaigns stand out at 1.

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

DVSA lists 1 safety recall campaigns for the Mazda Demio, covering roughly 84,062 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.

Mazda Demio inspection results in other countries

Netherlands APK stands out at 68.0%, against 50.8% nationally.

higher = larger sharecompare shares in percentage points

The verdict is consistent across every regime where the difference is clear, which is the strongest form this comparison takes: independent inspectorates, different rulebooks, same direction of travel.

Worth dwelling on how mundane the top of that list is: tyre pressure, tread depth, headlight aim. The Dutch APK records 1.892 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 Mazda Demio 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.

One caveat before you read the UK row: these are raw failure rates, because no other country publishes the age detail our index needs. This model's raw UK rate looks worse than the national average while its age-adjusted index is 97.2 — the fleet here is unusually old, and the raw column silently credits that. The index above is the fair comparison; this table is for reading each country against itself.

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.. Adapted; licences and full notice.

Mazda Demio MOT: quick answers

Mazda Demio MOT Risk Index is close to the reference at 97.2, 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 Mazda Demio first-time MOT pass rate?

61.69% of first attempts passed in 2024 (616 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 38.31% figure is the first-time initial failure rate, using 616 primary tests as the denominator (first-time, excluding retests). The age-adjusted MOT initial-failure ratio 97.2 is shown separately because raw rates compare fleet age as well as cars.

Compare the Mazda Demio with other cars

Ford C-MAX is highest at 97.4; Hyundai i10 is lowest at 97.1 — the gap is 0.3 points.

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

Same brand

All Mazda MOT statisticsMazda 2 MOT statsMazda 6 MOT stats

Similar risk

Hyundai Tucson (index 97.3)Hyundai i10 (index 97.1)Ford C-MAX (index 97.4)

Same size class

how Rover 214 compareshow LDV Convoy compareshow Mazda MPV compares

By build year

Mazda Demio 2002Mazda Demio 2003

By area

Mazda Demio MOT failure rate by postcode area

By failure group

Mazda Demio body, chassis and structure failuresMazda Demio brakes failuresMazda Demio vehicle identification failuresMazda Demio lamps, reflectors and electrics failuresMazda Demio noise, emissions and leaks failuresMazda Demio seat belts and airbags failuresMazda Demio steering failuresMazda Demio suspension failuresMazda Demio tyres failuresMazda Demio visibility failures

Inspections abroad

Mazda Demio in the Netherlands