1978 Jaguar XJ — MOT History by Age
How cars manufactured in 1978 perform at MOT as they age
48 years
Current Age
75.0%
Latest Pass Rate
32
Total Tests (All Years)
39,285 mi
Avg Mileage (Latest)
Data from official DVSA MOT testing records
Insufficient data for same-age comparison.
How This Car Ages
📉
Insufficient data for this analysis
Pass Rate Trend
📊
Insufficient data for this analysis
Year-by-Year MOT Results
2021
75.0%
Age (yrs) 43Tests 32Avg Mileage 39,285Top Failure Noise, emissions and leaks — 18.8%
Common MOT Failures
Top failure categories across all test years for 1978 Jaguar XJ, with age trends.
Noise, emissions and leaks
18.8%
— Consistent
Lamps, reflectors and electrical equipment
15.6%
— Consistent
Body, chassis, structure
9.4%
— Consistent
Non-component advisories
9.4%
— Consistent
Steering
9.4%
— Consistent
How Failures Change With Age
Comparing failure rates between the youngest and oldest test years.
| Category | At Youngest | At Oldest | Change | Trend |
|---|---|---|---|---|
| Noise, emissions and leaks | 18.8% (43 yrs) | 18.8% (43 yrs) | 0.0%
| ⚪ — |
| Lamps, reflectors and electrical equipment | 15.6% (43 yrs) | 15.6% (43 yrs) | 0.0%
| ⚪ — |
| Body, chassis, structure | 9.4% (43 yrs) | 9.4% (43 yrs) | 0.0%
| ⚪ — |
| Non-component advisories | 9.4% (43 yrs) | 9.4% (43 yrs) | 0.0%
| ⚪ — |
| Steering | 9.4% (43 yrs) | 9.4% (43 yrs) | 0.0%
| ⚪ — |
Other Manufacture Years
Looking for the best year to buy? See the full comparison on the Jaguar XJ page →
About This Data
This page shows how Jaguar XJ cars manufactured in 1978 perform at MOT as they age. Data spans from 2021 to 2021, covering 32 tests. Pass rates naturally decline with age as components wear.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.