The picture
Xj 6 N: above-average pass rates, with caveats
Across 608 MOT tests, the Xj 6 N returns 84.2% first-time pass — above the UK fleet average. The single most-logged Major fail is tyre tread under the limit. A non-functioning shock absorber and rear registration plate lamp round out the top three. Average tested mileage sits at 26,102, 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
Tyre tread depth not in accordance with the requirements
12 occurrences · 2.0% of tests
- 02
A shock absorber not functioning or leaking severely
12 occurrences · 2.0% of tests
- 03
A rear registration plate lamp or light source missing or inoperative in the case of a single lamp or all lamps
8 occurrences · 1.3% of tests
- 04
Reflector missing or reflecting white to the rear
8 occurrences · 1.3% of tests
- 05
Stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
7 occurrences · 1.2% of tests
- 06
Number plate does not conform to the specified requirements
5 occurrences · 0.8% of tests
- 07
A headlamp missing, inoperative or more than ½ not functioning in the case of LED
5 occurrences · 0.8% of tests
- 08
A tyre valve seriously damaged or misaligned likely which could cause sudden deflation of the tyre
5 occurrences · 0.8% of tests
- 09
The aim of a headlamp is not within limits laid down in the requirements
4 occurrences · 0.7% of tests
- 10
A lamp missing or inoperative
4 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
£76–£165
If every one of this XJ 6 N'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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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
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 XJ 6 N?
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 XJ 6 N 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.