MOT Risk Index.co.uk

Porsche Cayman — MOT statistics 2024

The Porsche Cayman failed 11.45% of 14,370 first MOT attempts in 2024 ("first-time", excluding retests). Adjusted for the age of the fleet, its initial-failure ratio is 37.3 (100 = expected for its age profile). This car fails its MOT about 63% less often than expected for its age.

MOT risk index 37.3, 95% CI 35.6–39.0 (100 = national average) 100 37.3 0 200
Index
37.3
100 = age-normal
Raw fail rate
11.45%
n = 14,370
Dangerous /100
4
national ≈11
Rank
57 of 761
lower index = better

Age-adjusted peer: Porsche 911 (index 35.8) — the two published results are 1.5 index points apart.

Porsche Cayman common problems: what actually fails the MOT

Suspension is well below the reference at 2.6 per 100 tests, against 15.7 per 100 tests across UK vehicles of the same ages.

higher bar = fails more oftenrate per 100 tests

Porsche Cayman 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 & electrical5.24,03818.10.29×0.28–0.29
Brakes4.23,31411.80.36×0.35–0.37
Tyres4.23,2669.10.46×0.44–0.48
Visibility3.42,6628.00.43×0.41–0.44
Suspension2.62,00515.70.17×0.16–0.17
Emissions & leaks1.71,3023.80.45×0.41–0.46
Named defects — items per 100 initial tests, this family vs UK national average; this model measured on 78,380 tests, 2019-2024, national column 2024
What failedper 100 tests (this family)per 100 tests (UK average)ratio family / UKWhat to check
Brake pipe damaged or excessively corrodedBrake pipe damaged or excessively corroded1.741.411.24×Look underneath for rust or cracks around subframe and suspension mountings
Lambda coefficient outside the default limits or…Lambda coefficient outside the default limits or the range specified by the manufacturer0.750.531.42×Ask the seller about: Lambda coefficient outside the default limits or the range s
Windscreen or window damaged or seriously…Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view1.812.360.77×Check wipers, washers and windscreen chips in the driver's view
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 functioning1.372.090.66×Try every light and switch — lamps are a top failure
Tyre seriously damagedA tyre seriously damaged1.432.540.56×Check tyre tread depth across the full width
Aim of a headlamp is not within limits laid down…The aim of a headlamp is not within limits laid down in the requirements1.082.570.42×Try every light and switch — lamps are a top failure
Wiper blade missing or obviously not clearing the…Wiper blade missing or obviously not clearing the windscreen0.572.220.26×Check wipers, washers and windscreen chips in the driver's view
Tyre tread depth not in accordance with the…Tyre tread depth not in accordance with the requirements1.803.590.50×Check tyre tread depth across the full width
Spring or spring component fractured or seriously…A spring or spring component fractured or seriously weakened0.862.860.30×Ask the seller about: A spring or spring component fractured or seriously weakened
Suspension pin, bush or joint excessively wornA suspension pin, bush or joint excessively worn0.674.870.14×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.

Porsche Cayman MOT advisories: what gets flagged

Tyres are highest at 28.2 per 100 tests; Body & structure are lowest at 1.2 per 100 tests — the gap is 27.0 per 100 tests.

higher bar = flagged more oftenadvisory items per 100 initial tests

Porsche Cayman MOT advisories: what gets flagged — 2024 UK MOT data
Advisory rates table
GroupAdvisories per 100
Tyres28.2
Brakes27.1
Suspension6
Non-component advisories5.1
Emissions & leaks2
Body & structure1.2

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

Tyres, brakes and suspension: Porsche Cayman against cars of the same age

AgePartPorsche CaymanSame age, petrol and dieselDifference
3 yearsTyres3.214.17-0.96
3 yearsBrakes0.161.77-1.61
3 yearsSuspension0.190.63-0.44
4 yearsTyres2.564.54-1.98
4 yearsBrakes0.322.43-2.11
4 yearsSuspension0.121.21-1.09
5 yearsTyres3.045.06-2.02
5 yearsBrakes0.423.09-2.67
5 yearsSuspension0.42.19-1.79
6 yearsTyres2.555.54-2.99
6 yearsBrakes0.673.81-3.14
6 yearsSuspension0.353.72-3.37
7 yearsTyres2.595.95-3.36
7 yearsBrakes0.854.55-3.70
7 yearsSuspension0.495.68-5.19
8 yearsTyres2.576.31-3.74
8 yearsBrakes1.075.38-4.31
8 yearsSuspension0.737.78-7.05

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 failed18.7%2,210
It passed9.8%51,745

A failed test raises next year's chance of failing again by 8.9 percentage points. The failure most likely to come back is lamps, reflectors and electrical equipment — 22.3% 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 77,975 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 only38.1fails less often than expected
Age and annual mileage45.1fails less often than vehicles driven as much
Share doing under 3,000 miles a year22.4%a normal spread of use

Mileage matters here: matching on how much these are driven moves the figure by 7.0 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 Porsche Cayman 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.

AgePorsche CaymanSame class, same ageDifferenceTests
3 years5.8%10.8%-4.99 pp5,737
4 years4.93%12.38%-7.45 pp5,902
5 years6.6%14.2%-7.6 pp6,481
6 years5.89%16.13%-10.25 pp6,522
7 years6.18%18.3%-12.12 pp5,554
8 years6.86%20.6%-13.74 pp5,321
9 years8.19%23.16%-14.97 pp4,789
10 years10.02%25.67%-15.65 pp4,421
11 years11.49%28.3%-16.82 pp4,127
12 years15.53%30.63%-15.1 pp4,526
13 years17.74%32.72%-14.98 pp5,816
14 years18.09%34.68%-16.59 pp5,258
15 years19.92%36.12%-16.2 pp4,764
16 years20.62%37.17%-16.54 pp4,054
17 years21.76%37.53%-15.77 pp3,070
18 years22.5%37.88%-15.38 pp1,613
19 years20.51%37.45%-16.94 pp156

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 Porsche Cayman perform as it gets older?

The Cayman at age 15 is well below the reference at 13.2%, against 41.6% for all vehicles of the same age.

higher = larger sharecompare shares in percentage points

How does the Porsche Cayman perform as it gets older? — 2024 UK MOT data

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

Takeaway: a 10-year-old Cayman has roughly a 8% chance of failing its MOT.

Data table
AgePorsche CaymanAll vehiclesGap
34.2%12.4%-8.2 pp
44.8%13.1%-8.3 pp
57.5%15.1%-7.6 pp
67.0%17.5%-10.5 pp
78.0%20.2%-12.2 pp
87.0%23.3%-16.4 pp
96.9%26.5%-19.7 pp
108.1%30.1%-22.0 pp
117.9%33.2%-25.3 pp
128.3%35.7%-27.4 pp
1310.8%38.2%-27.3 pp
1413.6%40.4%-26.8 pp
1513.2%41.6%-28.4 pp
1618.0%43.1%-25.1 pp
1720.5%43.1%-22.6 pp
1822.1%43.9%-21.8 pp
1920.5%43.5%-23.0 pp

Is a Porsche Cayman ULEZ compliant?

The share of classifiable 2024 Porsche Cayman MOT tests likely ULEZ compliant by first-registration date is 98.9%.

Based on 14,314 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 = 18
3–5 years100.0%
Check a registration with TfL
n = 1,912
6–7 years100.0%
Check a registration with TfL
n = 2,113
8 years100.0%
Check a registration with TfL
n = 993
9 years100.0%
Check a registration with TfL
n = 1,077
10–14 years100.0%
Check a registration with TfL
n = 3,683
15–17 years100.0%
Check a registration with TfL
n = 2,915
18 years99.9%
Check a registration with TfL
n = 1,447
19 yearsSuppressed — sample below publication threshold
Check a registration with TfL
n = 156
20+ yearsSuppressed — sample below publication threshold
Check a registration with TfL
n = 0

How dangerous are Porsche Cayman MOT failures?

Major defects are well below the reference at 15.3 per 100 tests, against 52.8 per 100 tests nationally.

higher bar = fails more oftenrate per 100 tests

How dangerous are Porsche Cayman MOT failures? — 2024 UK MOT data
Severity table
SeverityThis family /100National /100Family / national
Minor4.5914.220.32×
Major15.3052.750.29×
Dangerous3.9411.150.35×

Chart values: Minor 4.6 · Major 15.3 · Dangerous 3.9.

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

Does the month of a Porsche Cayman MOT matter?

Feb is highest at 12.3%; Mar is lowest at 10.8% — the gap is 1.5 percentage points.

higher = larger sharecompare shares in percentage points

Does the month of a Porsche Cayman MOT matter? — 2024 UK MOT data

Chart scale: 9%–33%.

bars: Porsche Cayman · dashed: all class-4 cars

Month-by-month table
MonthPorsche CaymanAll vehiclesGap
Jan11.88%31.12%-19.2 pp
Feb12.29%29.99%-17.7 pp
Mar10.82%28.26%-17.4 pp
Apr11.5%29.78%-18.3 pp
May10.82%28.79%-18.0 pp
Jun11.15%28.15%-17.0 pp
Jul10.86%29.33%-18.5 pp
Aug11.58%29.2%-17.6 pp
Sep10.96%28.19%-17.2 pp
Oct12.24%30.34%-18.1 pp
Nov11.8%30.58%-18.8 pp
Dec12.04%29.33%-17.3 pp

Takeaway: the spread between best and worst month is 1.5 percentage points — booking month barely matters for this family. 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.

Porsche Cayman average mileage by age

At age 8, the middle half of Caymans runs from 16,827 miles to 39,285 miles, against 26,506 miles as the median.

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

Bars: Porsche Cayman · dashed: all class-4 cars — 2024 UK MOT data

Chart axes: car age, years · odometer scale 0–101k mi.

Does high mileage mean more Porsche Cayman 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+, 10.2% of those with under 40,000 miles failed first time versus 30.5% of those with over 140,000 miles.Inside this age group, higher mileage goes with more failures.

Does high mileage mean more Porsche Cayman MOT failures at the same age? — 2024 UK MOT data
Porsche Cayman: first-time failure by mileage within each age group (2024)
AgeOdometer% failing95% intervalTests
3–5<40k miles5.9%4.9–7.1%1,785
3–540-70k miles9.2%5.2–15.7%120 (rough estimate)
6–9<40k miles5.8%5–6.6%3,073
6–940-70k miles10.2%8.5–12.3%998
6–970-100k miles19.4%12.6–28.5%93 (rough estimate)
10–14<40k miles5.6%4.5–7%1,287
10–1440-70k miles9.6%8.3–11.1%1,686
10–1470-100k miles15.2%12.5–18.3%580
10–14100-140k miles15.8%10.2–23.6%114 (rough estimate)
15+<40k miles10.2%7.8–13.2%482 (rough estimate)
15+40-70k miles16.6%14.8–18.5%1,542
15+70-100k miles21.1%19.2–23.1%1,717
15+100-140k miles27%23.8–30.4%679
15+140k+ miles30.5%22.2–40.4%95 (rough estimate)

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

Mileage by age (p25 / median / p75)
Agep25Medianp75Tests
38,48713,12519,305456
410,70116,03923,047461
515,51522,05429,580995
619,06927,14136,2741,207
721,22730,37541,368906
816,82726,50639,285993
921,64033,67348,3151,077
1030,59443,41257,8161,194
1134,02446,75461,0721,051
1234,17847,04463,170349
1337,68950,76970,235554
1447,40662,04780,382535
1546,48165,15781,728660
1652,99270,74590,568873
1757,71175,88994,0731,382
1858,53776,19295,8941,447
1961,42181,88495,433156

A typical 8-year-old Cayman has ~26,506 miles on the clock. Much more — ask why; much less — check for gaps in the MOT history.

Where in Britain the Porsche Cayman fails its MOT most

Dundee area is highest at 25.7%; Dorchester area is lowest at 5.4% — the gap is 20.3 percentage points.

higher = larger sharecompare shares in percentage points

Where in Britain the Porsche Cayman fails its MOT most — 2024 UK MOT data
Toughest areas% failingvs model overall
Dundee (DD)25.7%+14.2 pp
Kirkcaldy (KY)20.47%+9.0 pp
Brighton (BN)18.93%+7.4 pp
London SW (SW)18.66%+7.2 pp
Southampton (SO)17.99%+6.5 pp
Easiest areas% failingvs model overall
Dorchester (DT)5.43%-6.1 pp
Telford (TF)6.45%-5.0 pp
St Albans (AL)6.81%-4.7 pp
Dartford (DA)7.62%-3.9 pp
Lancaster (LA)7.69%-3.8 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 the most coastal fifth of areas this model fails 2.1 pp more often than in the most inland fifth (r=-0.54, n=39 areas with ≥800 tests).

In areas with the highest mot centre density this model fails 3.1 pp more often than in the lowest fifth (r=0.46, n=39 areas with ≥800 tests).

In areas with the highest terrain gradient this model fails 2.5 pp more often than in the lowest fifth (r=0.44, n=26 areas with ≥800 tests).

Porsche Cayman Why do areas differ? — 2024 UK MOT data
Values shown in the quintile chart
FactorLow QHigh QGapCorrelation
Distance to coast12.0%9.9%-2.1 ppr=-0.54
MOT centre density9.9%13.0%+3.1 ppr=0.46
Terrain gradient11.3%13.8%+2.5 ppr=0.44

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
Distance to coast (km)-0.5363912.09.9-2.17.187.5
MOT centre density (per 10k vehicles)0.463399.913.0+3.15.17.6
Terrain gradient (% grade)0.4432611.313.8+2.50.63.1
Road-salt proxy (g/m²-yr)0.3173910.712.9+2.2222572.3
Frost days (days/year)0.3003911.112.3+1.210.732
Urban share (0–1)-0.2753912.510.0-2.40.50.9
Income deprivation (score)-0.1383510.310.0-0.30.10.2

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: 8%–17% failing.

Porsche Cayman survival: which cars are still on the road

By age 19 is well below the reference at 2.5%, against 100.0% at the ages 4–6 reference level.

higher = larger sharecompare shares in percentage points

Porsche Cayman 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 %
35,73791%5.8%
45,90293.7%4.93%
56,481100%6.6%
66,522100%5.89%
75,55488.1%6.18%
85,32184.4%6.86%
94,78976%8.19%
104,42170.2%10.02%
114,12765.5%11.49%
124,52671.8%15.53%
135,81692.3%17.74%
145,25883.4%18.09%
154,76475.6%19.92%
164,05464.3%20.62%
173,07048.7%21.76%
181,61325.6%22.5%
191562.5%20.51%

By age 18, only about 26% as many cars of this family present for MOT as at ages 4–6 (reference n≈6,301); survivors still fail at 22.5% vs 4.9% at age 4. Older cars that still appear are a selected subset — weaker ones have already left.

How many miles does a Porsche Cayman last?

100,000+ miles stands out at 5.2%.

higher = larger sharecompare shares in percentage points

OdometerTests ≥ thresholdShare of sample
100,000+ miles4,0245.16%

Of 78,033 tests of this family with a usable odometer in 2024, 5.2% had reached 100k miles. This is a cross-section of cars still presenting for MOT, not a full birth cohort.

How many years is a Porsche Cayman likely to last?

Bought at age 5 is highest at 10.0 years; Bought at age 15 is lowest at 2.3 years — the gap is 7.7 years.

bigger number = longer remaining lifeyears on the observed survival curve

Age nowTypical mileage (p50)Expected years left
5—10
8—8.5
10—8
12—5.9
15—at least 2.3

estimateEstimate only — not a warranty: a typical 10-year-old example of this family has about 8.0 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.

Porsche Cayman faults that come together

Body & structure + Emissions & leaks stand out at 21.54×, against 1.00× if the faults were independent.

above 1.0× = more than expectedbelow 1.0× = less

Group AGroup BTogetherLift
Body, chassis, structureNoise, emissions and leaks19621.54× (rough estimate)
Body, chassis, structureSteering5614.18× (rough estimate)
BrakesSteering11011.03× (rough estimate)
Lamps, reflectors and electrical equipmentSeat belts and supplementary restraint systems409.34× (rough estimate)
Lamps, reflectors and electrical equipmentNoise, emissions and leaks3018.79× (rough estimate)
SteeringSuspension788.55× (rough estimate)
Lamps, reflectors and electrical equipmentSteering1278.54× (rough estimate)
Noise, emissions and leaksSteering488.4× (rough estimate)
BrakesNoise, emissions and leaks1908.27× (rough estimate)
BrakesSuspension2867.8× (rough estimate)
Seat belts and supplementary restraint systemsSuspension207.61× (rough estimate)
Body, chassis, structureBrakes1207.56× (rough estimate)
Body, chassis, structureLamps, reflectors and electrical equipment1767.44× (rough estimate)
BrakesSeat belts and supplementary restraint systems217.31× (rough estimate)
BrakesLamps, reflectors and electrical equipment4257.11× (rough estimate)
Lamps, reflectors and electrical equipmentSuspension3576.53× (rough estimate)
Noise, emissions and leaksSuspension1306.19× (rough estimate)
Seat belts and supplementary restraint systemsVisibility246.14× (rough estimate)
Identification of the vehicleLamps, reflectors and electrical equipment676.11× (rough estimate)
Body, chassis, structureSuspension835.72× (rough estimate)
Identification of the vehicleTyres454.89× (rough estimate)
BrakesIdentification of the vehicle334.49× (rough estimate)
Lamps, reflectors and electrical equipmentTyres3114.15× (rough estimate)
Noise, emissions and leaksTyres1184.1× (rough estimate)
Lamps, reflectors and electrical equipmentVisibility3334.09× (rough estimate)
BrakesTyres2034.04× (rough estimate)
Body, chassis, structureVisibility833.84× (rough estimate)
SteeringVisibility483.54× (rough estimate)
Noise, emissions and leaksVisibility1103.52× (rough estimate)
Identification of the vehicleVisibility343.4× (rough estimate)
SuspensionTyres1543.35× (rough estimate)
BrakesVisibility1763.23× (rough estimate)
SteeringTyres372.96× (rough estimate)
TyresVisibility1992.91× (rough estimate)
SuspensionVisibility1392.79× (rough estimate)
Body, chassis, structureTyres452.26× (rough estimate)
Seat belts and supplementary restraint systemsTyres19too few (rough estimate)
Identification of the vehicleNoise, emissions and leaks19too few (rough estimate)
Noise, emissions and leaksSeat belts and supplementary restraint systems18too few (rough estimate)
Identification of the vehicleSuspension18too few (rough estimate)
Lamps, reflectors and electrical equipmentRoad Wheels17too few (rough estimate)
Body, chassis, structureIdentification of the vehicle13too few (rough estimate)
Seat belts and supplementary restraint systemsSteering12too few (rough estimate)
BrakesRoad Wheels12too few (rough estimate)
Road WheelsTyres10too few (rough estimate)
Road WheelsSuspension8too few (rough estimate)
Identification of the vehicleSeat belts and supplementary restraint systems7too few (rough estimate)
Body, chassis, structureSeat belts and supplementary restraint systems7too few (rough estimate)
Identification of the vehicleSteering6too few (rough estimate)

Defects in «Body, chassis, structure» and «Noise, emissions and leaks» appear together 21.54× more often than chance (196 co-occurrences in the same test; 66 pairs compared).

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 Porsche Cayman?

Cars driven under 5,000 miles a year is well below the reference at 4.6%, against 10.2% for cars driven 8,000–12,000 miles a year.

higher = larger sharecompare shares in percentage points

BandFail %Tests
<5k miles/year4.62%7,629
8–12k miles/year10.15%1,222
Gap (low − normal)-5.53 pp—
By fuel and age

Petrol

AgeLow-use fail %nNormal fail %nGap pp
54.653,83110.79630-6.15 pp
64.583,7989.46592-4.88 pp
74.713,40011.52434-6.81 pp
84.723,32514.78372-10.06 pp
95.492,85916.29350-10.79 pp
107.352,54519.15329-11.8 pp
118.462,35118.4288-9.94 pp
1210.952,42927.64351-16.68 pp
1312.693,08831.16414-18.47 pp
1414.592,87923.42269-8.83 pp

At matched ages 5–14, cars averaging under 5k miles/year fail at 4.6% vs 10.2% for 8–12k miles/year — 5.5 pp lower (n_low=7,629, n_normal=1,222). 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.

Best year for a Porsche Cayman, and the years to avoid

Build year 2018 is highest at 115.2; Build year 2009 is lowest at 78.5 — the gap is 36.7 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

Porsche Cayman build year vs the same model at the same age · 100 = as expected — 2024 UK MOT data
Porsche Cayman 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
202085.259.1–111.24.43%925no different
2019102.387.3–117.35.71%3,136no different
2018115.2102.8–127.66.52%5,092worse
201795.884.4–107.25.53%4,923no different
201694.684.7–104.65.7%6,109no different
201589.680.5–98.65.7%6,653better
2014100.491.9–1097.26%7,255no different
201390.682.4–98.97.29%6,321better
20128774.1–99.98.47%2,067better
201183.574.4–92.69.66%3,333better
201089.280.4–98.111.95%3,280better
200978.571.5–85.512.06%4,062better
2008108.6101.9–115.218.63%5,458worse
2007107.3102.3–112.320.28%8,726worse
2006110105.2–114.821.91%9,285worse
2005108.793.4–12422.27%871no different

The best build year here is 2009 and the weakest is 2018. 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 — 7 of 16 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.

Porsche Cayman MOT repair costs

The MOT-failure repair budget per test runs from £25.44 to £48.34, against £54.85 for the test itself.

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

MOT repairs, budget
£25–48
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
Lamps, reflectors and electrical equipment5.2 (nat. 18.09)Battery replacement (standard 12V lead-acid)£140£7.28
Brakes4.2 (nat. 11.25)Front brake pads (parts + labour, typical hatchback)£150£6.30
Suspension2.6 (nat. 15.36)Suspension coil spring (single corner)£180£4.68
Tyres4.2 (nat. 8.7)Tyre (single mid-range 16" fitted)£90£3.78
Noise, emissions and leaks1.7 (nat. 3.67)Exhaust rear silencer£200£3.40

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 £25 to £48, 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.

Porsche Cayman running costs for a fleet

Vehicles failing at age 10 are close to the reference at 8.0%, against 8.0% at age 5, tested in the same year.

higher = larger sharecompare shares in percentage points

Fails per 100 at age 5
8
vehicles needing work (rough estimate: 995 tests)
At age 10
8
other cars of this model tested at age 10 in 2024 (rough estimate: 1,194 tests)
Repairs per 100
£2,544
plus £5,485 in test fees
Off the road
2d
median; 28.43% cleared same day
Failure rate and typical odometer by age
AgeFailsMedian odometerTestsGap vs age 5
34.17%13,125456-3.4 pp
44.77%16,039461-2.8 pp
57.54%22,054995+0.0 pp
67.04%27,1411,207-0.5 pp
77.95%30,375906+0.4 pp
86.95%26,506993-0.6 pp
96.87%33,6731,077-0.7 pp
108.12%43,4121,194+0.6 pp
117.9%46,7541,051+0.4 pp
128.31%47,044349+0.8 pp
1310.83%50,769554+3.3 pp
1413.64%62,047535+6.1 pp
1513.18%65,157660+5.6 pp
1617.98%70,745873+10.4 pp
1720.55%75,8891,382+13.0 pp
1822.05%76,1921,447+14.5 pp
1920.51%81,884156+13.0 pp

No single year stands out as the point where this model starts costing more: the year-to-year steps in its failure rate are too small or rest on too few tests to name one (D1 rule: a step is named only with at least 2,000 tests on both sides and a jump above 3 percentage points).

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.

Porsche Cayman rust problems: where they corrode

Age-standardised corrosion susceptibility is well below the reference at 0.67×, against 1.00× for the national age-standardised rate.

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

How it rusts
0.67×
0.51% of tests record a corrosion defect vs 0.77% typical — age-standardised
Salt Belt exposure
43rd
percentile among the models published here, from its tests across 39 postcode areas

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

Suspension is highest at 7.8%; Non-component advisories are lowest at 0.0% — the gap is 7.8 percentage points.

higher = more likelypercentage is the observed transition probability

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

Porsche Cayman chance the same component fails at the next MOT, given an advisory now — 2024 UK MOT data
Porsche Cayman, advisory → failure conversion by component group, chained tests 2019–2024. Chart labels and rates: Suspension 7.8% · Brakes 7.1% · Steering 6% · Body & chassis 5.8% · Tyres 5.6% · Noise, emissions, leaks 4.7% · Non-component 0%.
Advisory today → failure at the next test, with how long you have
ComponentFails next timeTypical lead timeMiles of warningAdvisories tracked
Suspension7.8%12 months3,2982,497
Brakes7.0%12.1 months2,4168,266
Steering6.0%12 months2,878586
Body, chassis, structure5.8%12 months2,867642
Tyres5.5%12 months3,4149,182
Noise, emissions and leaks4.7%12.2 months2,7971,163
Non-component advisories0.0%——2,827

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 8 in 100 cars, and the median gap is 12 months and roughly 3,298 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 Porsche Cayman?

Lamps, reflectors and electrical equipment after a failure at age 15-19 are highest at 12.6%; Lamps, reflectors and electrical equipment after a passed at age <3 are lowest at 0.5% — the gap is 12.1 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
<3passedTyres 2.2% · Visibility 1.9% · Lamps, reflectors and electrical equipment 0.5%2,845
<3advisoryVisibility 4.2% · Tyres 3.3%450 (rough estimate)
<3failureTyres 3.9% · Visibility 2.9%206 (rough estimate)
3-5passedTyres 2.4% · Visibility 2.0% · Lamps, reflectors and electrical equipment 0.7%12,143
3-5advisoryTyres 3.7% · Visibility 3.1% · Brakes 0.8%2,489
3-5failureTyres 4.4% · Visibility 4.3% · Lamps, reflectors and electrical equipment 1.3%901
6-8passedVisibility 2.3% · Tyres 1.9% · Lamps, reflectors and electrical equipment 0.9%9,798
6-8advisoryTyres 4.3% · Visibility 4.0% · Brakes 2.5%2,566
6-8failureVisibility 4.5% · Tyres 4.4% · Brakes 3.5%865
9-11passedLamps, reflectors and electrical equipment 2.9% · Visibility 2.3% · Tyres 1.9%6,069
9-11advisoryTyres 4.1% · Lamps, reflectors and electrical equipment 4.0% · Brakes 3.8%2,578
9-11failureLamps, reflectors and electrical equipment 6.4% · Brakes 5.9% · Visibility 4.7%1,193
12-14passedLamps, reflectors and electrical equipment 4.6% · Brakes 3.0% · Suspension 3.0%7,340
12-14advisoryLamps, reflectors and electrical equipment 8.4% · Brakes 5.8% · Visibility 5.4%3,971
12-14failureLamps, reflectors and electrical equipment 9.8% · Brakes 6.7% · Suspension 6.4%2,543
15-19passedLamps, reflectors and electrical equipment 5.7% · Suspension 4.1% · Brakes 3.2%3,327
15-19advisoryLamps, reflectors and electrical equipment 10.4% · Suspension 6.4% · Brakes 6.2%2,034
15-19failureLamps, reflectors and electrical equipment 12.6% · Noise, emissions and leaks 7.6% · Suspension 7.4%1,623

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.

Porsche Cayman ownership: what six years of MOTs show

The ten-day re-test pass rate is highest at 65.4%; The later re-test pass rate is lowest at 6.2% — the gap is 59.1 percentage points.

higher = larger sharecompare shares in percentage points

Fixed same day
28.43%
of failures re-tested
Fails /10k miles
0.354
miles actually driven
Clean streaks
63.48%
3+ tests, nothing noted
Odometer anomaly
0.501%
reading went backwards

Failing is usually a same-week event, not a disaster. Of 6,257 failures followed through to their re-test, 28.43% were repaired and passed the same day and 65.35% within ten days; the median gap is 2 days. 12,474 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 0.354 failures per 10,000 miles, on a median of 2,451 miles a year across 14,755 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. 63.48% of these cars strung together three or more tests with nothing recorded at all, while 16.28% 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: 0.501% of 14,758 chains show a reading lower than the previous test, with a median drop of 6,110 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.

Porsche Cayman safety recalls and how to check yours

DVSA recall campaigns stand out at 10.

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

recall campaigns launched per year

Porsche Cayman recall campaigns launched per year — 2024 UK MOT data
Campaigns launched per year for the Porsche Cayman. Source: DVSA vehicle safety recalls. Chart values: 2010: 0 · 2011: 0 · 2012: 0 · 2013: 0 · 2014: 1 · 2015: 0 · 2016: 0 · 2017: 0 · 2018: 0 · 2019: 3 · 2020: 1 · 2021: 2 · 2022: 0 · 2023: 1 · 2024: 1.
Most recent safety recall campaigns for the Porsche Cayman
ReferenceLaunchedVehiclesConcern
R/2024/24305/06/20240ARA7 Recall campaign - Replace shift cable
R/2024/00120/12/202345On affected vehicles the rear spoiler setting may not meet specifications due to incorrect
R/2021/31415/09/20211,854REAR AXLE CARRIER SIDE PARTS MAY NOT MEET REQUIRED SPECIFICATIONS
R/2021/13924/03/202174CONNECTING RODS INSTALLED MAY NOT BE TO SPECIFICATION
R/2020/02605/02/2020157THE TIGHTNESS OF THE HIGH PRESSURE FUEL LINE ON CYLINDER BANK 2 CANNOT BE GUARANTEED DUE T
All 10 campaigns
ReferenceLaunchedBuild datesVehiclesConcern
R/2024/24305/06/202423/06/2023 – 21/03/20240ARA7 Recall campaign - Replace shift cable
R/2024/00120/12/202323/06/2023 – 19/10/202345On affected vehicles the rear spoiler setting may not meet specifications due to incorrect
R/2021/31415/09/202101/01/2014 – 01/07/20141,854REAR AXLE CARRIER SIDE PARTS MAY NOT MEET REQUIRED SPECIFICATIONS
R/2021/13924/03/202119/01/2021 – 03/04/202174CONNECTING RODS INSTALLED MAY NOT BE TO SPECIFICATION
R/2020/02605/02/202017/07/2019 – 15/01/2020157THE TIGHTNESS OF THE HIGH PRESSURE FUEL LINE ON CYLINDER BANK 2 CANNOT BE GUARANTEED DUE T
R/2019/25023/08/201923/06/2015 – 16/06/20161,810AIR BAG CONTROL UNIT MAY HAVE BEEN INSTALLED WITH A FAULTY CAPACITOR
R/2019/09516/04/201923/02/2016 – 14/02/20191INADEQUATE CONNECTION BETWEEN LOWER LONGITUDINAL MEMBER AND CROSS MEMBER
R/2019/11125/03/201922/11/2017 – 25/04/2018211THE AIRBAG SENSORS IN THE SIDE MEMBERS ON THE VEHICLE MAY NOT BE SCREWED TIGHTLY ENOUGH
R/2014/15103/11/201405/05/2014 – 06/06/2014378BONNET CATCH ASSEMBLY MAY FAIL
R/2006/01424/01/200622/11/2005 – 13/12/2005111PARKING BRAKE MAY FAIL

DVSA lists 10 safety recall campaigns for the Porsche Cayman, covering roughly 4,641 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.

Porsche Cayman technical service bulletins: what dealers are told

US market, Porsche CAYMAN and its variants, model years 2015–2021 only. A count of bulletins, not a UK failure rate.

NHTSA manufacturer communications are 524.

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
20141
  • Electrical system (104)
  • Equipment (104)
  • Other / uncategorised (96)
  • Engine (78)
  • Engine and cooling (70)
  • Structure (28)
  • Powertrain (25)
  • Wheels (23)
20157
20168
20175
20186
201928
202039
202143
202245
202358
202481
202598
2026105

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.

Porsche Cayman owner complaints: what goes wrong

US market, Porsche CAYMAN and its variants, model years 2015–2021 only. A count of owner complaints, not a UK failure rate; NHTSA has no UK denominator.

Restraints are highest at 7; Transmission (not MOT-tested) is lowest at 1 — the gap is 6.

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
Restraints758.3%not in top 6—complained about, rarely an MOT failure
Engine (not MOT-tested)216.7%not in top 6—complained about, rarely an MOT failure
Lamps & electrical216.7%5.2#1complained about and fails often
Transmission (not MOT-tested)18.3%not in top 6—complained about, rarely an MOT failure
Steering18.3%not in top 6—complained about, rarely an MOT failure
Visibility18.3%3.4#4complained about, fails occasionally

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
Porsche dashboard leather has strunk and separated from the main dashboard. My understanding is that in the event of an accident, this could interfere with the airbag's ability to deploy correctly. A Porsche dealer has reviewed but was unable to repair it. The next step would be to replace. I've discovered this is a very common issue with Porsche vehicles from model years similar to this one.
NHTSA complaint, filed 07/31/2024 · AIR BAGS
My door panels are delaminating around where the side curtain airbags are located. It has me concerned about driving the vehicle if I was involved in an accident.
NHTSA complaint, filed 01/21/2022 · AIR BAGS

US owners have filed 12 complaints about the equivalent Porsche Cayman to the National Highway Traffic Safety Administration0. 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.

Porsche Cayman inspection results in other countries

Netherlands APK is well below the reference at 29.2%, against 50.8% nationally.

higher = larger sharecompare shares in percentage points

Same model, different national inspection regimes
CountryTestThis model failsNational averagePositionSample
United KingdomMOT (class 4)11.45%26.01%-14.6 pp14,370
NetherlandsAPK29.2%50.8%-21.6 pp681

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.

The exact faults Netherlands records — APK defect codes, 2024
CodeFaultRecordedType
210Tyre pressure not at the correct value122failure
516Dipped headlight incorrectly aimed54failure
AC1Tyre down to 1.6–2.5 mm of tread31advisory
584Sidelight not working properly23failure
205Tyre with insufficient tread20failure
203Tyre damaged19failure
916Remleiding door corrosie aangetast15failure
391Wipers leave insufficient visibility15failure

Worth dwelling on how mundane the top of that list is: tyre pressure, tread depth, headlight aim. The Dutch APK records 0.67 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 Porsche Cayman 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.. Adapted; licences and full notice.

Porsche Cayman MOT: quick answers

Porsche Cayman MOT Risk Index is well below the reference at 37.3, 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 Porsche Cayman first-time MOT pass rate?
88.55% of first attempts passed in 2024 (14,370 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 11.45% figure is the first-time initial failure rate, using 14,370 primary tests as the denominator (first-time, excluding retests). The age-adjusted MOT initial-failure ratio 37.3 is shown separately because raw rates compare fleet age as well as cars.

Compare the Porsche Cayman with other cars

Jaguar F-Type is highest at 43.0; Porsche 911 is lowest at 35.8 — the gap is 7.2 points.

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

Same brand

All Porsche MOT statisticsPorsche 911 MOT statsPorsche Boxster MOT stats

Similar risk

Porsche 911 (index 35.8)BMW M3 (index 39.8)Jaguar F-Type (index 43.0)

Same size class

how Bentley Continental compareshow Chevrolet Spark compareshow Jaguar F-Type compares

By build year

Porsche Cayman 2005Porsche Cayman 2006Porsche Cayman 2007Porsche Cayman 2008Porsche Cayman 2009Porsche Cayman 2010Porsche Cayman 2011Porsche Cayman 2012Porsche Cayman 2013Porsche Cayman 2014Porsche Cayman 2015Porsche Cayman 2016Porsche Cayman 2017Porsche Cayman 2018Porsche Cayman 2019Porsche Cayman 2020

By area

Porsche Cayman MOT failure rate by postcode area

By failure group

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

Inspections abroad

Porsche Cayman 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:porsche-cayman:dvsa-2024-v2. Full method: methodology.

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