What Happens If My Car Fails Its MOT? Driving Rules, Repairs and Retests
By RegPeek Editorial Team · Published
A fail is not the end of the world, but what you can do next depends entirely on how the defects were graded.
The short answer
If your car fails, you get a refusal notice listing the defects. You can only drive away if your existing MOT is still valid and the car has no dangerous defect. A dangerous defect means the vehicle must not be driven at all until it is repaired.
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Check a VehicleThe three defect grades
Dangerous
A direct and immediate risk to road safety or a serious impact on the environment. The vehicle fails and must not be driven until repaired — even if the old certificate has days left.
Major
A fault that may affect safety or the environment. The vehicle fails. You can drive it only if the previous MOT is still valid and the car is roadworthy.
Minor and advisory
Minor defects do not cause a fail but are recorded and should be fixed soon. Advisories flag items that are acceptable now but wearing out — repeated advisories are a useful signal when reading MOT history before buying.
Getting the repairs done
- You are not obliged to use the test centre — you can take the car anywhere for repairs, or do them yourself.
- Get a written quote before agreeing to work.
- Keep the refusal notice; the retest is based on the items listed on it.
Retest rules
Leave the vehicle at the test centre and a retest before the end of the next working day is free. Take it away and return within 10 working days and a partial retest on the failed items is free at many centres. Beyond that a full test and fee usually apply — see MOT costs and retest fees.
Never drive a car with a dangerous defect to another garage. Recovery is cheaper than the penalty for using a dangerously defective vehicle.
Appealing a result
If you believe the result is wrong, raise it with the test centre first. If that does not resolve it you can complain to DVSA within 14 days of the test using the official complaint form. Do not repair the disputed items before the appeal is assessed.
Prevention is easier: work through the common failure points before your next test.
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Related guides
- 15 Most Common MOT Failures and a Pre-MOT ChecklistThe faults that fail most cars at MOT and a practical checklist you can work through at home in 20 minutes before the test.
- How Much Does an MOT Cost in the UK? 2026 Prices and Retest FeesThe maximum MOT fees set by DVSA, what garages actually charge, when a retest is free and which extra costs are not part of the test.
- Is There an MOT Grace Period in the UK?There is no MOT grace period in the UK. Here is what the law actually allows, the fines for driving without an MOT and the only legal exceptions.
- How to Read MOT History Before Buying a Used CarA practical guide to reading a used car's MOT history: mileage patterns, repeat advisories, test gaps and the red flags worth walking away from.
RegPeek is an independent vehicle information service and is not affiliated with DVLA or DVSA. This guide is general information, not legal advice.