How reliable is the Jaguar Xjs compared with other cars?

We do not publish a comparison for the Jaguar Xjs, because the cars of this model that have been tested do not cover a wide enough range of ages and mileages. Its raw pass rate is 79.7% across 3,113 tests, but comparing a raw rate between models mostly ranks them by how new they are rather than how good they are. The failure and advisory patterns further down the page are still drawn from real tests and are worth reading.

What is the most common MOT failure on a Jaguar Xjs?

The item recorded most often is "Parking brake efficiency below minimum requirement", which appears in 14.4% of failed Jaguar Xjs tests. Because one failed test can list several items, these shares do not add up to 100%.

What do testers most often warn about on a Jaguar Xjs?

The most common advisory is "Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users", noted on 15.3% of all Jaguar Xjs tests. An advisory is not a failure: it flags something that will likely need attention before the next test.

What mileage does a Jaguar Xjs usually have at its MOT?

The average odometer reading recorded at test is 80,485 miles. This is the mileage across all tested examples of every age, not an annual figure, so treat it as a description of the fleet rather than a target for one car.

Model reliability file

Jaguar Xjs MOT pass rate & common failures

From 3,113 recorded MOT tests of the Jaguar Xjs, published by DVSA.

Data updated 29 July 2026

Quick answer

Across 3,113 MOT tests, 79.7% of Jaguar Xjs tests ended in a pass. This figure is not adjusted for age or mileage, so it is not a reliability ranking: the Jaguar Xjs fleet does not yet cover a wide enough spread of ages and distances to compare it fairly against other models. Its most commonly recorded failure is parking brake efficiency below minimum requirement, which appears in 14.4% of failed tests. Cars of this model average 80,485 miles on the odometer when tested.

At a glance

Recorded pass rate

79.7%unadjusted, not comparable3,113 tests

We are not publishing a ranking for the Xjs. The examples tested do not cover a wide enough spread of ages and mileages to compare it fairly, and an unadjusted pass rate mostly sorts models by how recently they were bought rather than how well they were built. The failure and advisory patterns below come from the same 3,113 tests and are worth reading on their own terms.

DVSA recorded wording

Most common failure items

Share of failed Jaguar Xjs tests in which each item was recorded. One failed test often lists several items, so these do not sum to 100%.

1.Parking brake efficiency below minimum requirement14.4%
81 occurrencesParking brake efficiency too low explained
2.Significant brake effort recorded with no brake applied indicating a binding brake13.5%
76 occurrencesBrake binding or imbalanced across an axle explained
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 repaired13.1%
74 occurrencesSuspension mounting corroded or insecure explained
4.The aim of a headlamp is not within limits laid down in the requirements9.9%
56 occurrencesHeadlamp aim incorrect explained
5.Parking brake efficiency less than 50% of the required value9.4%
53 occurrencesParking brake efficiency too low explained
6.A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning7.8%
44 occurrencesLamp not working explained
7.Windscreen washers not working or not providing sufficient fluid to clear the windscreen7.6%
43 occurrencesWiper or washer not working properly explained
8.Parking brake inoperative on one side7.5%
42 occurrencesParking brake efficiency too low explained
9.Vehicle structure corroded to the extent that the rigidity of the assembly is seriously reduced7.1%
40 occurrencesCorrosion in a structural area explained
10.The strength or continuity of the load bearing structure within 30cm of any seat belt anchorage (a 'prescribed area') is significantly reduced or inadequately repaired7.1%
40 occurrencesSeat belt anchorage corroded or weakened explained

Warnings without a failure

Most common advisories

Share of all Jaguar Xjs tests carrying each advisory. The denominator differs from the failure list above because an advisory can be issued on a car that passed.

1.Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users15.3%
476 tests
2.A wheel bearing with excessive play14.6%
456 testsWheel bearing has excessive play or is rough explained
3.A spring or spring component fractured or seriously weakened14.3%
445 testsRoad spring broken or fractured explained
4.A tyre seriously damaged10.3%
321 testsTyre damaged or deteriorated explained
5.Tyre tread depth not in accordance with the requirements7.2%
224 testsTyre worn close to the legal limit explained
6.A suspension pin, bush or joint excessively worn6.8%
211 testsSuspension arm bush worn explained
7.Brake pipe damaged or excessively corroded4.7%
146 testsBrake pipe corroded explained
8.Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users4.1%
128 tests

What gets tested

The Xjs fleet

Average mileage recorded at test: 80,485
Fuel mix of tested cars: Petrol99.8%

Check a specific Jaguar Xjs

A model average tells you the pattern. Its own MOT record tells you the car.

Compare within the range

Other Jaguar models

Jaguar XF — 77.9% adjusted
Jaguar F-Pace — 84.6% adjusted
Jaguar XE — 82.0% adjusted
Jaguar E-Pace — 87.3% unadjusted
Jaguar I-Pace — 91.5% unadjusted
Jaguar XJ — 79.9% adjusted
All Jaguar models

Common questions

How reliable is the Jaguar Xjs compared with other cars?: We do not publish a comparison for the Jaguar Xjs, because the cars of this model that have been tested do not cover a wide enough range of ages and mileages. Its raw pass rate is 79.7% across 3,113 tests, but comparing a raw rate between models mostly ranks them by how new they are rather than how good they are. The failure and advisory patterns further down the page are still drawn from real tests and are worth reading.
What is the most common MOT failure on a Jaguar Xjs?: The item recorded most often is "Parking brake efficiency below minimum requirement", which appears in 14.4% of failed Jaguar Xjs tests. Because one failed test can list several items, these shares do not add up to 100%.
What do testers most often warn about on a Jaguar Xjs?: The most common advisory is "Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users", noted on 15.3% of all Jaguar Xjs tests. An advisory is not a failure: it flags something that will likely need attention before the next test.
What mileage does a Jaguar Xjs usually have at its MOT?: The average odometer reading recorded at test is 80,485 miles. This is the mileage across all tested examples of every age, not an annual figure, so treat it as a description of the fleet rather than a target for one car.

How this was worked out

Method and limits

Figures come from the DVSA anonymised MOT testing dataset, published under the Open Government Licence. Only class 4 initial tests are counted: retests are excluded so a car appears once, and abandoned tests are excluded entirely. No adjusted rate is shown because this model's tested examples do not cover enough of the national age and mileage range for standardisation to mean anything.

An MOT measures whether a car met a legal standard on the day. It is not a breakdown record, a service history or a running-cost estimate, and a pass rate is a property of a fleet rather than a prediction about one car.