The picture
520d M Sport Mhev Auto: a strong MOT record by UK norms
Across 4,234 MOT tests, the 520d M Sport Mhev Auto returns 88.2% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is a seriously damaged tyre. Windscreen damage and a tyre with the cords showing round out the top three. Average tested mileage sits at 32,901, 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 tyre seriously damaged
156 occurrences · 3.7% of tests
- 02
Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view
78 occurrences · 1.8% of tests
- 03
A tyre cords visible or damaged
76 occurrences · 1.8% of tests
- 04
Tyre tread depth not in accordance with the requirements
76 occurrences · 1.8% of tests
- 05
A tyre seriously damaged
49 occurrences · 1.2% of tests
- 06
Engine MIL illuminated indicating a malfunction
43 occurrences · 1.0% of tests
- 07
Wiper blade defective
29 occurrences · 0.7% of tests
- 08
Number plate does not conform to the specified requirements
21 occurrences · 0.5% of tests
- 09
Any fracture or welding defect on a wheel
20 occurrences · 0.5% of tests
- 10
Engine MIL illuminated indicating a malfunction
17 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 2 failures
£120–£190
If every one of this 520d M Sport Mhev Auto'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 520d M Sport Mhev Auto?
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 520d M Sport Mhev Auto 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.