Petrol Jaguar Xj: MOT pass rate

76.5% of petrol Jaguar Xjs pass the MOT first time, measured across 11,398 DVSA tests on that fuel type alone. Average mileage at test was 96,694.

Petrol against the other Jaguar Xj versions

Why the fuel type changes the number

Petrol cars avoid the DPF and emissions failures that catch diesels, and usually fail on the same consumables as any other car.

On the Jaguar Xj specifically, diesel is the strongest at 81.6%, and this petrol version sits 2.6 points below the 79.1% model average.

What it means if you are buying one

The petrol Jaguar Xj fails more often than the model average, so budget for the items that catch this fuel type and treat a fresh MOT as worth paying for. Buying a damaged one? run it through the analyzer, check the exact car, decode the VIN and check the mileage before you bid.

Mileage is part of the answer

The average petrol Jaguar Xj had covered 96,694 miles at test, against 88,202 for the diesel. That is above average and into the range where cambelts and water pumps are due if they have not already been done, so ask for the service history rather than take the mileage on trust.

Fuel type and mileage are tangled together: diesels are usually bought by higher-mileage drivers, so some of any gap between fuels is the miles rather than the engine. The per-year figures on the Jaguar Xj page separate age from fuel if you want to isolate one.

Most common MOT failures on a petrol Jaguar Xj

1. A shock absorber bush excessively worn, 1.5% of tests (7.85x the national rate for this defect)
2. Steering rack gaiter or ball joint dust cover missing or no longer prevents the ingress of dirt etc, 3.8% of tests (5.1x the national rate for this defect)
3. Vehicle structure corroded to the extent that the rigidity of the assembly is seriously reduced, 2% of tests (4.95x the national rate for this defect)
4. Emissions levels exceed default limits, 1.7% of tests (4.73x the national rate for this defect)
5. A suspension joint dust cover missing or no longer prevents the ingress of dirt etc, 8.2% of tests (4.46x the national rate for this defect)
6. The strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired, 3.4% of tests (3.65x the national rate for this defect)
7. Lambda coefficient outside the default limits or the range specified by the manufacturer, 1.5% of tests (3.02x the national rate for this defect)
8. Brake pipe damaged or excessively corroded, 2% of tests (1.9x the national rate for this defect)
9. Engine MIL illuminated indicating a malfunction, 2.1% of tests (1.67x the national rate for this defect)
10. Windscreen washers not working or not providing sufficient fluid to clear the windscreen, 2.1% of tests (1.25x the national rate for this defect)

From 11,542 DVSA-tracked petrol Jaguar Xj tests, 2024, split out from the Jaguar Xj's other fuel types. DVSA testers marked 3.3% of these flagged defects as "dangerous", against 5.11% nationally. See which fuel type fails on the most dangerous defects nationally for how that compares across the whole fleet.

Most common MOT advisories on a petrol Jaguar Xj

Flagged but doesn't fail the car, a different list from the failures above.

1. A wheel bearing with excessive play, 7.6% of tests (11.74x the national rate for this defect)
2. A shock absorber bush excessively worn, 4.6% of tests (9.65x the national rate for this defect), also fails
3. The strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired, 7.1% of tests (4.71x the national rate for this defect), also fails
4. A brake hose ferrule excessively corroded, 4.9% of tests (3.88x the national rate for this defect)
5. Vehicle structure corroded to the extent that the rigidity of the assembly is seriously reduced, 4.8% of tests (3.88x the national rate for this defect), also fails
6. Brake pipe damaged or excessively corroded, 16.6% of tests (2.68x the national rate for this defect), also fails
7. A suspension component excessively damaged or corroded, 12.2% of tests (2.36x the national rate for this defect)
8. Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users, 11.5% of tests (2.07x the national rate for this defect)
9. A spring or spring component fractured or seriously weakened, 9.4% of tests (1.99x the national rate for this defect)
10. A suspension pin, bush or joint excessively worn, 19.5% of tests (1.46x the national rate for this defect)

From 11,542 DVSA-tracked petrol Jaguar Xj tests, 2024.

Other Jaguar Xj fuel types

• Diesel Jaguar Xj - 81.6%

All Jaguar Xj MOT data · Every model