MOT guide

Most Common MOT Failure Reasons in the UK

Many MOT failures come from basic faults that could have been spotted before the test, such as worn tyres, faulty bulbs, poor visibility, brake issues and suspension wear.

Quick answer

Many MOT failures come from basic faults that could have been spotted before the test, such as worn tyres, faulty bulbs, poor visibility, brake issues and suspension wear.

Top reasons cars fail MOT tests

  • Tyres below legal tread depth or with sidewall damage
  • Lights not working correctly
  • Brake wear, imbalance or reduced performance
  • Suspension wear or broken components
  • Windscreen damage or poor visibility
  • Emissions faults and warning lights

Simple checks before the test

Check every exterior light including brake lights and indicators.

Inspect tyre tread depth and sidewall condition.

Top up washer fluid and ensure wipers clear the screen properly.

Listen for suspension knocks and feel for braking issues.

Make sure no warning lights remain on the dashboard if they affect the MOT.

Why prevention matters

A failed MOT can create extra cost, delay and stress.

Basic pre-test checks often reduce the chance of obvious failures and can save money on retesting.

Best approach

Treat the MOT as part of regular maintenance, not a surprise yearly event.

If the car already shows faults in braking, steering, visibility or warning lights, get them checked before the test date.

FAQ

Frequently asked questions

Do warning lights fail an MOT?

Some do. It depends on the system and whether the warning light indicates a fault in a tested area.

Can a bald tyre fail an MOT?

Yes. Tyres below the legal tread limit or with dangerous damage can fail immediately.

Should I book a pre-MOT check?

It can be a smart move if the car has known issues or has not been inspected for a while.