1997 Jaguar XJ — MOT failures & pass rate
4,384 MOT tests on the 1997 Jaguar XJ are in this dataset, and 78.8% of them passed. Against executive cars of a similar age (22.2% fail rate), the 1997 XJ comes out 1.1pp better. Failures cluster in suspension, lighting & signalling and body, structure & corrosion.
What the MOT record shows
No single area dominates — suspension (9.3%) and lighting & signalling (9.3%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are catalyst emissions, component mounting prescribed areas and headlamp aim — catalyst emissions alone was recorded 343 times.
Mileage is the strongest signal on the record: 12.0% of 0-30k cars fail, rising to 27.5% once past 150k — 2.3× the risk.
Suspension is the most common advisory, noted on 41.3% of tests — work that passed today but is likely due soon.
The trend is improving — the fail rate fell from 23.0% in 2021 to 20.8% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Suspension | 9.3% | 409 |
| 2 | Lighting & signalling | 9.3% | 406 |
| 3 | Body, structure & corrosion | 6.3% | 277 |
| 4 | Brakes | 6.3% | 275 |
| 5 | Emissions & environmental | 5.3% | 231 |
| 6 | Visibility | 3.9% | 171 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Catalyst emissions | 343 |
| 2 | Component mounting prescribed areas | 274 |
| 3 | Headlamp aim | 202 |
| 4 | Integral vehicle structure condition | 180 |
| 5 | Prescribed areas | 171 |
| 6 | Chassis condition | 116 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Suspension | 41.3% | 1,809 |
| 2 | Brakes | 20.6% | 903 |
| 3 | Tyres | 19.6% | 860 |
| 4 | Body, structure & corrosion | 15.7% | 688 |
| 5 | Emissions & environmental | 15.0% | 659 |
| 6 | Other defects | 9.6% | 422 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 0-30k | 108 | 12.0% |
| 30-60k | 416 | 13.7% |
| 60-90k | 1,098 | 17.9% |
| 90-120k | 1,373 | 21.9% |
| 120-150k | 846 | 24.9% |
| 150k+ | 516 | 27.5% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 1,130 | 23.0% |
| 2022 | 987 | 20.4% |
| 2023 | 860 | 20.8% |
| 2024 | 721 | 20.1% |
| 2025 | 686 | 20.8% |
What to check before buying a 1997 XJ
The failure pattern for this year is specific enough to inspect against: suspension accounted for 9.3% of tests. Start there.
- Suspension (9.3% of tests): Worn drop links, bushes, springs or shocks — listen for knocks over bumps and check for uneven tyre wear. Typical repair: £150–£450 per corner.
- Lighting & signalling (9.3% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Body, structure & corrosion (6.3% of tests): The one to take seriously on older cars — corrosion to structural areas can be costly and is an MOT failure. Typical repair: £200–£1,500+.
Repair costs are rough UK ballpark ranges to set expectations, not quotes — actual prices vary widely by car, parts and garage.
Frequently asked questions
How many 1997 Jaguar XJs pass their MOT?
78.8% of the 4,384 1997 Jaguar XJ MOT tests in this dataset passed — a 21.2% fail rate.
What is the most common MOT failure on a 1997 Jaguar XJ?
Suspension, recorded in 9.3% of tests, followed by lighting & signalling (9.3%).
Does the 1997 XJ get worse with mileage?
Its MOT fail rate rises from 12.0% in the 0-30k band to 27.5% in the 150k+ band.
Methodology & source. Based on 4,384 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-27. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.