The picture
Zx-12r: a strong MOT record by UK norms
Across 1,160 MOT tests, the Zx-12r returns 87.2% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is a non-functioning shock absorber. A binding brake and tyre tread under the limit round out the top three. Average tested mileage sits at 29,599, 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 shock absorber not functioning or leaking severely
14 occurrences · 1.2% of tests
- 02
Significant brake effort recorded with no brake applied indicating a binding brake
12 occurrences · 1.0% of tests
- 03
Tyre tread depth not in accordance with the requirements
8 occurrences · 0.7% of tests
- 04
Number plate does not conform to the specified requirements
6 occurrences · 0.5% of tests
- 05
Rate of flashing not between 60 and 120 times per minute
6 occurrences · 0.5% of tests
- 06
Projected beam image is obviously incorrect
6 occurrences · 0.5% of tests
- 07
The aim of a headlamp is not within limits laid down in the requirements
5 occurrences · 0.4% of tests
- 08
Brake disc or drum excessively weakened, insecure or fractured
4 occurrences · 0.3% of tests
- 09
Excessive fluctuation in brake effort through each wheel revolution
4 occurrences · 0.3% of tests
- 10
The aim of a headlamp is not within limits laid down in the requirements
4 occurrences · 0.3% 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
£75–£130
If every one of this ZX 12r'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
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
Item 02 · Amazon UK
MOT-spec replacement number plate
Faded or non-standard plates fail outright. Replacements take ten minutes online with V5C details.
Search Amazon UK
Buying or keeping a ZX 12r?
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 ZX 12r 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.