The picture
Xk8: middle-of-the-pack on first-time pass
Across 8,068 MOT tests, the Xk8 returns 76.3% first-time pass — roughly in line with the UK fleet average. The single most-logged Major fail is the strength or continuity of the load bearing. Windscreen damage and warning device shows system malfunction round out the top three. Average tested mileage sits at 85,305, 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
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
325 occurrences · 4.0% of tests
- 02
Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view
207 occurrences · 2.6% of tests
- 03
Warning device shows system malfunction
192 occurrences · 2.4% of tests
- 04
A suspension joint dust cover severely deteriorated
182 occurrences · 2.3% of tests
- 05
Lambda coefficient outside the default limits or the range specified by the manufacturer
174 occurrences · 2.2% of tests
- 06
A suspension pin, bush or joint excessively worn
153 occurrences · 1.9% of tests
- 07
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
151 occurrences · 1.9% of tests
- 08
Wiper blade missing or obviously not clearing the windscreen
134 occurrences · 1.7% of tests
- 09
Brake pipe damaged or excessively corroded
113 occurrences · 1.4% of tests
- 10
A rear registration plate lamp or light source missing or inoperative in the case of multiple lamps or light sources
111 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 Xk8?
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 Xk8 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.