1988 Jaguar XJ — MOT failures & pass rate
331 MOT tests on the 1988 Jaguar XJ are in this dataset, and 81.0% of them passed. Against executive cars of a similar age (17.4% fail rate), the 1988 XJ comes out 1.6pp worse. Failures cluster in lighting & signalling, brakes and suspension.
What the MOT record shows
No single area dominates — lighting & signalling (10.6%) and brakes (7.8%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are component mounting prescribed areas, rbt (sp) and service brake performance — component mounting prescribed areas alone was recorded 17 times.
Mileage matters less than usual here: the 1988 XJ fails 23.9% of the time in the 0-30k band and 22.7% at 120-150k, a spread of only 1.2 points.
Suspension is the most common advisory, noted on 27.2% of tests — work that passed today but is likely due soon.
The trend is improving — the fail rate fell from 18.8% in 2021 to 10.6% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 10.6% | 35 |
| 2 | Brakes | 7.8% | 26 |
| 3 | Suspension | 7.2% | 24 |
| 4 | Body, structure & corrosion | 4.5% | 15 |
| 5 | Visibility | 4.5% | 15 |
| 6 | Steering | 3.6% | 12 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Component mounting prescribed areas | 17 |
| 2 | Rbt (sp) | 14 |
| 3 | Service brake performance | 13 |
| 4 | Position lamp | 12 |
| 5 | Washers | 10 |
| 6 | Headlamp | 10 |
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 | 27.2% | 90 |
| 2 | Brakes | 14.8% | 49 |
| 3 | Tyres | 14.2% | 47 |
| 4 | Emissions & environmental | 13.3% | 44 |
| 5 | Steering | 10.9% | 36 |
| 6 | Body, structure & corrosion | 9.7% | 32 |
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 | 46 | 23.9% |
| 30-60k | 48 | 6.3% |
| 60-90k | 116 | 20.7% |
| 90-120k | 60 | 18.3% |
| 120-150k | 44 | 22.7% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 80 | 18.8% |
| 2022 | 78 | 20.5% |
| 2023 | 71 | 25.4% |
| 2024 | 55 | 16.4% |
| 2025 | 47 | 10.6% |
What to check before buying a 1988 XJ
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 10.6% of tests. Start there.
- Lighting & signalling (10.6% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (7.8% of tests): Pads/discs are routine wear; binding, imbalance or corroded pipes are more serious — test for pulling under braking. Typical repair: £100–£350 per axle.
- Suspension (7.2% 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.
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 1988 Jaguar XJs pass their MOT?
81.0% of the 331 1988 Jaguar XJ MOT tests in this dataset passed — a 19.0% fail rate.
What is the most common MOT failure on a 1988 Jaguar XJ?
Lighting & signalling, recorded in 10.6% of tests, followed by brakes (7.8%).
Does the 1988 XJ get worse with mileage?
Its MOT fail rate rises from 23.9% in the 0-30k band to 22.7% in the 120-150k band.
Methodology & source. Based on 331 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.