The picture
Tr6: above-average pass rates, with caveats
Across 1,090 MOT tests, the Tr6 returns 84.6% first-time pass — above the UK fleet average. The single most-logged Major fail is brakes imbalance across an axle such. A weak handbrake and a torn steering gaiter round out the top three. Average tested mileage sits at 46,774, 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
Brakes imbalance across an axle such that the braking effort from any wheel is less than 70% of the maximum effort recorded from the other wheel on the same axle.
20 occurrences · 1.8% of tests
- 02
Parking brake efficiency below minimum requirement
18 occurrences · 1.7% of tests
- 03
Steering rack gaiter or ball joint dust cover damaged or deteriorated
17 occurrences · 1.6% of tests
- 04
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
17 occurrences · 1.6% of tests
- 05
A suspension joint dust cover severely deteriorated
16 occurrences · 1.5% of tests
- 06
Significant brake effort recorded with no brake applied indicating a binding brake
15 occurrences · 1.4% of tests
- 07
A headlamp or light source missing, inoperative or more than ½ not functioning in the case of LED
15 occurrences · 1.4% of tests
- 08
Audible warning inoperative
15 occurrences · 1.4% of tests
- 09
A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
13 occurrences · 1.2% of tests
- 10
A headlamp or light source missing, inoperative or more than ½ not functioning in the case of LED
12 occurrences · 1.1% 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
£160–£480
If every one of this Tr6'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.
Buying or keeping a Tr6?
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 Tr6 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.