The picture
Sc430: middle-of-the-pack on first-time pass
Across 2,130 MOT tests, the Sc430 returns 78.7% first-time pass — roughly in line with the UK fleet average. The single most-logged Major fail is a torn suspension dust cover. Shock absorber damaged to the extent and the engine warning light staying lit round out the top three. Average tested mileage sits at 89,259, 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
A suspension joint dust cover severely deteriorated
61 occurrences · 2.9% of tests
- 02
A shock absorber damaged to the extent that it does not function or showing signs of severe leakage
53 occurrences · 2.5% of tests
- 03
Engine MIL illuminated indicating a malfunction
50 occurrences · 2.3% of tests
- 04
Headlamp reflector or lens slightly defective
41 occurrences · 1.9% of tests
- 05
Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view
36 occurrences · 1.7% of tests
- 06
A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
36 occurrences · 1.7% of tests
- 07
Lambda coefficient outside the default limits or the range specified by the manufacturer
35 occurrences · 1.6% of tests
- 08
Significant brake effort recorded with no brake applied indicating a binding brake
34 occurrences · 1.6% of tests
- 09
Exhaust system leaking or insecure
31 occurrences · 1.5% of tests
- 10
A tyre cords visible or damaged
29 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.
Worst-case fix budget · top 2 failures
£90–£320
If every one of this Sc430'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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Tools that pre-empt a retest.
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 Sc430?
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 Sc430 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.