DVSA Statistics
1978 Jaguar Xj
MOT Pass Rate & Pre-MOT Checklist
There isn't much MOT data yet for the 1978 Jaguar Xj (only 29 tests in our DVSA dataset), so these figures are a rough guide. We still highlight common failure items below so you can check before your MOT.
Pass Rate
Based on 29 DVSA anonymised MOT tests · About this data
Pass Rate
89.7%
Higher than average
Limited data available for this model; results may be less representative.
Top Failure Reasons
Common MOT failures for this model
Quick DIY Fix
Brake light bulbs are easy to replace yourself.
Based on DVSA statistics from 29 recorded tests.
Pre-MOT Checklist for 1978 Jaguar Xj
Based on common failure points for this model, check these items before your MOT:
- 1
Ensure engine is at operating temperature before test - take a good run beforehand
Emissions – Common fail on this model
- 2
Check for excessive play in steering wheel - should be minimal free movement
Steering – Common fail on this model
- 3
Check brake lights illuminate when pedal is pressed - have someone help you check
Lighting – Common fail on this model
- 4
Check windscreen for chips or cracks in the driver view zone (Zone A)
Visibility – Common fail on this model
- 5
Check exhaust for leaks, holes, or excessive corrosion - listen for blowing
Exhaust – Common fail on this model
Do you own this car?
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Frequently Asked Questions
Is a 1978 Jaguar Xj likely to fail its MOT?
Based on DVSA statistics, the 1978 Jaguar Xj has a 89.7% MOT pass rate. This is above average, indicating good reliability for a vehicle of this age.
What are the most common MOT failures on a 1978 Jaguar Xj?
The most common MOT failure reasons for a 1978 Jaguar Xj are: emissions levels exceed default limits, steering rack gaiter or ball joint dust cover missing or no longer prevents the ingress of dirt etc, stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning. Many of these can be checked and fixed before your test to improve your chances of passing.
How can I reduce the chance my 1978 Jaguar Xj fails its MOT?
To improve your chances of passing, check the items that commonly fail on this model: emissions levels exceed default limits, steering rack gaiter or ball joint dust cover missing or no longer prevents the ingress of dirt etc, stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning. Use our pre-MOT checklist above to identify potential issues before your test. Many common failures are easy DIY fixes.
How many 1978 Jaguar Xjs fail their MOT?
Around 10% of 1978 Jaguar Xjs fail their MOT test, meaning roughly 1 in 10 don't pass first time. The most common reasons are emissions levels exceed default limits and steering rack gaiter or ball joint dust cover missing or no longer prevents the ingress of dirt etc. Pre-checking these items can significantly improve your chances.
What should I check before my 1978 Jaguar Xj MOT?
Before your 1978 Jaguar Xj MOT, check these commonly-failed items: emissions levels exceed default limits, steering rack gaiter or ball joint dust cover missing or no longer prevents the ingress of dirt etc, stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning. Most are visual checks you can do at home – look for worn tyres, test all lights work, and check for obvious damage or leaks.
Is the 1978 Jaguar Xj reliable for MOT?
With a 89.7% MOT pass rate, the 1978 Jaguar Xj performs above average compared to typical vehicles. This suggests good overall condition for a vehicle of this age.