The picture
An400: above-average pass rates, with caveats
Across 960 MOT tests, the An400 returns 84.3% first-time pass — above the UK fleet average. The single most-logged Major fail is brake pads worn below 1.0 mm. Tyre tread under the limit and a binding brake round out the top three. Average tested mileage sits at 22,546, 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 lining or pad worn below 1.0mm
17 occurrences · 1.8% of tests
- 02
Tyre tread depth not in accordance with the requirements
17 occurrences · 1.8% of tests
- 03
Significant brake effort recorded with no brake applied indicating a binding brake
13 occurrences · 1.4% of tests
- 04
A shock absorber not functioning or leaking severely
12 occurrences · 1.3% of tests
- 05
Exhaust system leaking or insecure
11 occurrences · 1.1% of tests
- 06
A headlamp missing, inoperative or more than ½ not functioning in the case of LED
9 occurrences · 0.9% of tests
- 07
A lamp missing or inoperative
8 occurrences · 0.8% of tests
- 08
A stop lamp(s) does not illuminate by the operation of both brake controls or remains on when the brakes are released
8 occurrences · 0.8% of tests
- 09
Stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
7 occurrences · 0.7% of tests
- 10
Headlamp aim unable to be tested
7 occurrences · 0.7% 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
£260–£535
If every one of this An400'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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Build your own retest budget.
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.
Item 01 · Amazon UK
Brake pad measurement gauge
Testers fail pads under 1.5mm. A wear gauge tells you if you've got two months left or two weeks.
Search Amazon UK
Item 02 · Amazon UK
Digital tyre-tread depth gauge
Five quid for a gauge beats £150 for a retest. UK MOT minimum is 1.6mm — most testers fail anything below 2mm to be safe.
Search Amazon UK
Buying or keeping a An400?
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 An400 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.