DVSA Statistics
1978 Triumph Stag Auto
MOT Pass Rate & Pre-MOT Checklist
There isn't much MOT data yet for the 1978 Triumph Stag Auto (only 35 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 35 DVSA anonymised MOT tests · About this data
Pass Rate
88.6%
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
Windscreen wipers are easy to replace yourself.
Based on DVSA statistics from 35 recorded tests.
Pre-MOT Checklist for 1978 Triumph Stag Auto
Based on common failure points for this model, check these items before your MOT:
- 1
Check for excessive play in steering wheel - should be minimal free movement
Steering – Common fail on this model
- 2
Listen for knocks or clunks when driving over bumps - bounce each corner
Suspension – Common fail on this model
- 3
Check windscreen for chips or cracks in the driver view zone (Zone A)
Visibility – Common fail on this model
Do you own this car?
Check your specific vehicle for outstanding advisories or recalls. Get a personalized risk report for your exact Triumph Stag Auto.
Frequently Asked Questions
Is a 1978 Triumph Stag Auto likely to fail its MOT?
Based on DVSA statistics, the 1978 Triumph Stag Auto has a 88.6% 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 Triumph Stag Auto?
The most common MOT failure reasons for a 1978 Triumph Stag Auto are: steering rack gaiter or ball joint dust cover missing or no longer prevents the ingress of dirt etc, fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users, a suspension joint dust cover missing or no longer prevents the ingress of dirt etc. 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 Triumph Stag Auto fails its MOT?
To improve your chances of passing, check the items that commonly fail on this model: steering rack gaiter or ball joint dust cover missing or no longer prevents the ingress of dirt etc, fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users, a suspension joint dust cover missing or no longer prevents the ingress of dirt etc. Use our pre-MOT checklist above to identify potential issues before your test. Many common failures are easy DIY fixes.
How many 1978 Triumph Stag Autos fail their MOT?
Around 11% of 1978 Triumph Stag Autos fail their MOT test, meaning roughly 1 in 9 don't pass first time. The most common reasons are steering rack gaiter or ball joint dust cover missing or no longer prevents the ingress of dirt etc and fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users. Pre-checking these items can significantly improve your chances.
What should I check before my 1978 Triumph Stag Auto MOT?
Before your 1978 Triumph Stag Auto MOT, check these commonly-failed items: steering rack gaiter or ball joint dust cover missing or no longer prevents the ingress of dirt etc, fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users, a suspension joint dust cover missing or no longer prevents the ingress of dirt etc. 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 Triumph Stag Auto reliable for MOT?
With a 88.6% MOT pass rate, the 1978 Triumph Stag Auto performs above average compared to typical vehicles. This suggests good overall condition for a vehicle of this age.