Porsche
924
1,621 MOT tests analysed. lands in the middle of the pack — here's where 924s pass, fail, and end up on the retest sheet.
That's 1.6 points below the UK fleet average across our 1,984 tracked models — buyers should expect more first-time fails than the typical UK car.
Pass
75.9%
Pass-after-fix
4.1%
Fail
18.4%
Avg miles
50,275
Pass + Pass-after-fix + Fail = 100%
Petrol cars registered before January 2006 are typically pre-Euro 4 — subject to daily charges in London ULEZ, Birmingham CAZ, and Glasgow LEZ. Bristol CAZ does not charge petrol cars. Daily charges if driven in the zone: London £12.50 · Birmingham £8.00 .
The picture
924: middle-of-the-pack on first-time pass
Across 767 MOT tests, the 924 returns 72.4% first-time pass — below the UK fleet average. The single most-logged Major fail is a binding brake. Windscreen washers not working and a number-plate lamp out round out the top three. Average tested mileage sits at 51,266, which is the lens to read those failure rankings through. If you own one and the next test is close, the ranked list below is a sensible pre-test checklist.
ABI Insurance Group
Group 38–50
A high-group car — insurance costs will be significantly above average. Lower groups cost less to insure; UK fleet average is around Group 22.
Source: ABI Group Rating Panel · administered by Thatcham Research · groups cover standard variants; performance trims may sit higher. Browse all insurance groups →
38–50
out of 50
Top ten reasons for rejection.
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- 01
A rear registration plate lamp or light source missing or inoperative in the case of multiple lamps or light sources
55 occurrences · 3.4% of tests
- 02
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
54 occurrences · 3.3% of tests
- 03
A battery insecure but not likely to fall from carrier
45 occurrences · 2.8% of tests
- 04
Emissions levels exceed default limits
37 occurrences · 2.3% of tests
- 05
Significant brake effort recorded with no brake applied indicating a binding brake
33 occurrences · 2.0% of tests
- 06
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
29 occurrences · 1.8% of tests
- 07
Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view
27 occurrences · 1.7% of tests
- 08
Audible warning inoperative
25 occurrences · 1.5% of tests
- 09
The strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired
24 occurrences · 1.5% of tests
- 10
The aim of a headlamp is not within limits laid down in the requirements
23 occurrences · 1.4% of tests
Counts cover Major and Dangerous defects logged at test. Advisory items excluded so this shows why a car was rejected, not just what the tester flagged in passing.
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Buying or keeping a 924?
Use the failure ranking as a pre-test checklist or a haggling lever. Treat the headline pass rate as a fleet-wide trend, not a guarantee on any individual car.
If you own a 924 and your last MOT looked nothing like the ranked failures above, that's normal — individual cars vary widely. The ranking shows the patterns testers flag most often across the country.