The picture
Cg125: middle-of-the-pack on first-time pass
Across 2,285 MOT tests, the Cg125 returns 76.6% first-time pass — roughly in line with the UK fleet average. The single most-logged Major fail is a non-functioning shock absorber. A missing rear reflector and headlamp missing, inoperative round out the top three. Average tested mileage sits at 22,174, 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
46 occurrences · 2.0% of tests
- 02
Reflector missing or reflecting white to the rear
34 occurrences · 1.5% of tests
- 03
A headlamp missing, inoperative or more than ½ not functioning in the case of LED
28 occurrences · 1.2% of tests
- 04
Stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
28 occurrences · 1.2% of tests
- 05
A lamp missing or inoperative
27 occurrences · 1.2% of tests
- 06
Tyre tread depth not in accordance with the requirements
25 occurrences · 1.1% of tests
- 07
A direction indicator lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
22 occurrences · 1.0% 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
22 occurrences · 1.0% of tests
- 09
Projected beam image is obviously incorrect
21 occurrences · 0.9% of tests
- 10
A footrest missing or insecure
18 occurrences · 0.8% 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
£18–£115
If every one of this Cg125'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
Headlight restoration kit
Yellowed lenses fail the light-output test. A restoration kit lifts the haze in an afternoon for £20.
Search Amazon UK
Item 02 · Amazon UK
H7 / W21W bulb pack
A spare-bulb kit lives in the boot. Test morning is not the time to find your stop-lamp's gone.
Search Amazon UK
Buying or keeping a Cg125?
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 Cg125 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.