MOT failure data · 2025
Jaguar XJS MOT problems
Across every Jaguar XJS that failed its 2025 MOT, the defect testers recorded most often was service brake performance excessively binding, on 5.05% of failure items. The broadest problem area was lamps, reflectors and electrical equipment at 25.75%. These are recorded defects across the model, not a diagnosis of any one car.
Most common Jaguar XJS MOT failures
| # | Recorded defect | Area | Share |
|---|---|---|---|
| 1 | Service brake performance excessively binding | Brakes | 5.05% |
| 2 | Rbt (sp) efficiency below requirements | Brakes | 4.21% |
| 3 | Component mounting prescribed areas prescribed area excessively corroded significantly reducing structural strength | Suspension | 3.85% |
| 4 | Headlamp aim too high | Lamps, reflectors and electrical equipment | 2.91% |
| 5 | Rbt (sp) efficiency less than 50% of the required value | Brakes | 2.76% |
Shares are of all recorded failure items for this model, so they sum to less than 100% — a single failed test often records several defects, and the long tail below the top 5 is not shown.
What this means if you are buying one
Use it as a viewing checklist. If you are looking at a Jaguar XJS, these are the areas worth inspecting and worth asking about — and worth reading the car's own MOT history for, since a defect that keeps reappearing as an advisory is a better signal than any model-wide average.
The MOT record also has hard limits: it does not check the engine, clutch or gearbox, and it says nothing about outstanding finance, insurance write-off history, stolen markers or whether the mileage is genuine. Our used Jaguar XJS buying guide covers what to check beyond the MOT.
Checking a specific Jaguar XJS?
Enter its registration for finance, write-off, stolen, mileage and keeper history.
Other Jaguar models
- Jaguar XF MOT problems
- Jaguar F-Pace MOT problems
- Jaguar XE MOT problems
- Jaguar E-Pace MOT problems
- Jaguar I-Pace MOT problems
- Jaguar XJ MOT problems
Jaguar XJS MOT FAQs
What does a Jaguar XJS most commonly fail its MOT on?
The single most recorded defect on Jaguar XJS cars failing their 2025 MOT was "service brake performance excessively binding", appearing on 5.05% of failure items.
Does this mean my Jaguar XJS will fail?
No. This is what testers recorded across every Jaguar XJS that failed in 2025. It shows where this model tends to need attention, not the condition of any individual car. The Jaguar XJS passed 81.91% of its initial tests.
How do I see a specific Jaguar XJS's MOT history?
Enter its registration on our free MOT history check to see that car's own test results, advisories and recorded mileages.
See also: Jaguar XJS MOT pass rate · used Jaguar XJS buying guide · free MOT history check
Defect counts from the DVSA MOT Anonymised test-item data for 2025 (class 4 initial tests, failure items only — advisories and minor defects excluded), licensed under the Open Government Licence v3.0.