The picture
Z3: middle-of-the-pack on first-time pass
Across 15,351 MOT tests, the Z3 returns 72.5% first-time pass — below the UK fleet average. The single most-logged Major fail is a corroded brake pipe. A defective headlamp lens and windscreen damage round out the top three. Average tested mileage sits at 86,912, 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.
Top ten reasons for rejection.
- 01
Brake pipe damaged or excessively corroded
595 occurrences · 3.9% of tests
- 02
Headlamp reflector or lens slightly defective
576 occurrences · 3.8% of tests
- 03
Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view
423 occurrences · 2.8% of tests
- 04
A spring or spring component fractured or seriously weakened
394 occurrences · 2.6% of tests
- 05
An SRS malfunction indicator lamp (MIL) indicates a system malfunction
384 occurrences · 2.5% of tests
- 06
A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
375 occurrences · 2.4% of tests
- 07
A suspension pin, bush or joint excessively worn
354 occurrences · 2.3% of tests
- 08
A rear registration plate lamp or light source missing or inoperative in the case of multiple lamps or light sources
352 occurrences · 2.3% of tests
- 09
Lambda coefficient outside the default limits or the range specified by the manufacturer
324 occurrences · 2.1% of tests
- 10
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
282 occurrences · 1.8% 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.
Worst-case fix budget · top 3 failures
£130–£410
If every one of this Z3's most-logged Major fails hit at the same MOT, that's the real-world UK garage range. Reality is usually one or two items, not all of them. Open the estimator →
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Picked against this car's top failure patterns. Affiliate links to Amazon UK — we earn a small cut at no cost to you. Disclosed up-front, doesn't shape the data.
Buying or keeping a Z3?
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 Z3 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.