1998 Jaguar XJ — MOT failures & pass rate
Across 4,569 MOT tests, the 1998 Jaguar XJ recorded a 77.1% pass rate. Executive cars of a similar age fail at 22.8%, so the 1998 XJ sits squarely on the average. Failures cluster in suspension, lighting & signalling and brakes.
What the MOT record shows
No single area dominates — suspension (11.2%) and lighting & signalling (8.5%) 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, integral vehicle structure condition and catalyst emissions — component mounting prescribed areas alone was recorded 400 times.
Mileage is the strongest signal on the record: 11.3% of 0-30k cars fail, rising to 28.9% once past 150k — 2.6× the risk.
Advisories point at the next bill rather than this one: suspension was flagged on 39.5% of tests without failing them.
The trend is improving — the fail rate fell from 24.4% in 2021 to 21.2% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Suspension | 11.2% | 511 |
| 2 | Lighting & signalling | 8.5% | 386 |
| 3 | Brakes | 7.3% | 333 |
| 4 | Body, structure & corrosion | 7.1% | 324 |
| 5 | Visibility | 5.3% | 241 |
| 6 | Tyres | 3.5% | 162 |
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 | 400 |
| 2 | Integral vehicle structure condition | 231 |
| 3 | Catalyst emissions | 223 |
| 4 | Prescribed areas | 189 |
| 5 | Chassis condition | 187 |
| 6 | Headlamp aim | 146 |
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 | 39.5% | 1,804 |
| 2 | Brakes | 23.2% | 1,059 |
| 3 | Tyres | 20.3% | 927 |
| 4 | Body, structure & corrosion | 15.3% | 701 |
| 5 | Other defects | 9.5% | 433 |
| 6 | Emissions & environmental | 8.1% | 370 |
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 | 133 | 11.3% |
| 30-60k | 664 | 14.5% |
| 60-90k | 1,449 | 21.0% |
| 90-120k | 1,319 | 25.9% |
| 120-150k | 680 | 28.5% |
| 150k+ | 315 | 28.9% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 1,218 | 24.4% |
| 2022 | 1,039 | 23.5% |
| 2023 | 894 | 22.4% |
| 2024 | 768 | 21.7% |
| 2025 | 650 | 21.2% |
What to check before buying a 1998 XJ
On a 1998 XJ, suspension is what the MOT record says goes wrong most — it appeared in 11.2% of tests. Check these areas before you commit.
- Suspension (11.2% 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.
- Lighting & signalling (8.5% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (7.3% 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.
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 1998 Jaguar XJs pass their MOT?
77.1% of the 4,569 1998 Jaguar XJ MOT tests in this dataset passed — a 22.9% fail rate.
What is the most common MOT failure on a 1998 Jaguar XJ?
Suspension, recorded in 11.2% of tests, followed by lighting & signalling (8.5%).
Does the 1998 XJ get worse with mileage?
Its MOT fail rate rises from 11.3% in the 0-30k band to 28.9% in the 150k+ band.
Methodology & source. Based on 4,569 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.