The picture
Gz125: middle-of-the-pack on first-time pass
Across 925 MOT tests, the Gz125 returns 70.2% first-time pass — below the UK fleet average. The single most-logged Major fail is a non-functioning shock absorber. A binding brake and direction indicator lamp missing round out the top three. Average tested mileage sits at 17,429, 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
55 occurrences · 5.9% of tests
- 02
Significant brake effort recorded with no brake applied indicating a binding brake
30 occurrences · 3.2% of tests
- 03
A direction indicator lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
28 occurrences · 3.0% of tests
- 04
A lamp missing or inoperative
18 occurrences · 1.9% of tests
- 05
Tyre tread depth not in accordance with the requirements
18 occurrences · 1.9% of tests
- 06
A stop lamp(s) remains on when the brakes are released
16 occurrences · 1.7% of tests
- 07
A stop lamp(s) does not illuminate by the operation of both brake controls or remains on when the brakes are released
16 occurrences · 1.7% of tests
- 08
Stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
15 occurrences · 1.6% of tests
- 09
Reflector missing or reflecting white to the rear
14 occurrences · 1.5% of tests
- 10
Brake lining or pad worn below 1.0mm
13 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.
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Buying or keeping a Gz125?
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 Gz125 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.