MOT test failures and costs explained
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Quick answer: MOT tests check roadworthiness — failures range from minor advisories to dangerous defects you cannot drive away until fixed, with maximum test fee around £54.85 for cars.
The DVSA sets MOT test standards and categories for defects. Retests are often free within ten working days at the same centre for partial retests. This guide explains failure categories and typical repair costs.
Common failures
Lights, tyres below 1.6mm tread depth, wipers, brakes and suspension wear top the annual failure list. Many of these are inexpensive to fix if caught early.
Diesel emissions failures on older cars are common, and DPF removal is an instant fail as well as illegal for road use. Ensure your DPF is present and functioning before the test.
Costs after fail
A simple bulb replacement costs a few pounds, while clutch or corrosion repairs can run to hundreds. Compare quotes from at least two garages before authorising work.
Some insurers and breakdown policies include MOT recall cover. Check your policy before paying for a retest or minor repair out of pocket.
Appeals
You can appeal to the DVSA within 14 days, and the vehicle will be re-inspected. You can continue using the car if it is safe while appealing minor disputes.
A pre-MOT check at a reputable garage reduces surprise failures on test day. It is not a substitute for the official test but catches obvious issues early.
Common questions
Can I drive with a failed MOT?
Dangerous defects mean you must not drive until repaired. Major fails generally require repair before legal road use in most circumstances.
Is retest free?
A partial retest is often free within ten working days at the same test centre if only the previously failed items were repaired. A full retest may be charged if additional defects are found.
Do advisories fail the MOT?
No — advisories are warnings for future maintenance. The car passes if there are no major or dangerous defects, even with several advisories listed.