The picture
Glc: a strong MOT record by UK norms
Across 69,329 MOT tests, the Glc returns 88.4% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is worn suspension bushes. Windscreen damage and tyre tread under the limit round out the top three. Average tested mileage sits at 45,435, 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 pin, bush or joint excessively worn
1,685 occurrences · 2.4% of tests
- 02
Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view
1,554 occurrences · 2.2% of tests
- 03
Tyre tread depth not in accordance with the requirements
1,416 occurrences · 2.0% of tests
- 04
A tyre seriously damaged
1,279 occurrences · 1.8% of tests
- 05
A tyre cords visible or damaged
942 occurrences · 1.4% of tests
- 06
a brake lining or pad worn below 1.5mm
586 occurrences · 0.8% of tests
- 07
Wiper blade defective
568 occurrences · 0.8% of tests
- 08
Engine MIL illuminated indicating a malfunction
457 occurrences · 0.7% of tests
- 09
Brake lining or pad worn down to wear indicator
423 occurrences · 0.6% of tests
- 10
Number plate does not conform to the specified requirements
280 occurrences · 0.4% 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 3 failures
£200–£430
If every one of this Glc'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 Glc?
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 Glc 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.