DVSA Statistics
1978 MG B
MOT Pass Rate & Pre-MOT Checklist
Used 1978 MG Bs usually pass their MOT, but around 1 in 6 still fail, most often for emissions levels exceed default limits, a suspension pin, bush or joint excessively worn and fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users. Based on 213 MOT tests from DVSA data, this page shows how this model performs and what to check before your test.
Pass Rate
Based on 213 DVSA anonymised MOT tests · About this data
Pass Rate
84.5%
Higher than average
Top Failure Reasons
Common MOT failures for this model
Quick DIY Fix
Windscreen wipers are easy to replace yourself.
Based on DVSA statistics from 213 recorded tests.
Pre-MOT Checklist for 1978 MG B
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
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 MG B.
Frequently Asked Questions
Is a 1978 MG B likely to fail its MOT?
Based on DVSA statistics, the 1978 MG B has a 84.5% 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 MG B?
The most common MOT failure reasons for a 1978 MG B are: emissions levels exceed default limits, a suspension pin, bush or joint excessively worn, fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users. 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 MG B fails its MOT?
To improve your chances of passing, check the items that commonly fail on this model: emissions levels exceed default limits, a suspension pin, bush or joint excessively worn, fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users. Use our pre-MOT checklist above to identify potential issues before your test. Many common failures are easy DIY fixes.
How many 1978 MG Bs fail their MOT?
Around 16% of 1978 MG Bs fail their MOT test, meaning roughly 1 in 6 don't pass first time. The most common reasons are emissions levels exceed default limits and a suspension pin, bush or joint excessively worn. Pre-checking these items can significantly improve your chances.
What should I check before my 1978 MG B MOT?
Before your 1978 MG B MOT, check these commonly-failed items: emissions levels exceed default limits, a suspension pin, bush or joint excessively worn, fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users. 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 MG B reliable for MOT?
With a 84.5% MOT pass rate, the 1978 MG B performs above average compared to typical vehicles. This suggests good overall condition for a vehicle of this age.