Top 10 Reasons Cars Fail Their MOT And How to Avoid Them

Staying roadworthy isn't just about safety, it's a legal must. For drivers, the MOT test is the yearly check that keeps cars in line with standards. Yet thousands fail it each year for reasons that are avoidable. Keep reading to discover the 10 reasons cars fail their MOT and how to avoid them.

Don't Overlook the Brakes

Brakes are checked for performance, balance, and condition. Stop-start traffic can wear them faster than you realise. If you hear grinding, feel a soft pedal, or notice a pull to one side when braking, have them looked at before your test. A fail due to brakes can lead to costly repairs and retests.

Mind the Tyres

Tyres must have at least 1.6mm tread depth across the central three-quarters. But uneven wear, sidewall damage, or mismatched tyres also raise red flags. Tyres with poor tread are not just unsafe, they are a quick MOT fail. Check pressures and wear often, especially if you drive a lot in wet conditions.

Faulty Lights and Indicators

Lights must be fully working, properly aligned, and clean. This includes your indicators, brake lights, number plate bulbs, and even reverse lights on newer cars. Light issues are a top cause of MOT failure. If you are in a city like Birmingham, spend a few minutes checking every bulb before booking an MOT test Birmingham.

Windscreen Woes

Wipers must clear the screen properly, and the washer system should work. Cracks or chips larger than 10mm in the driver's line of sight or over 40mm elsewhere are a no-go. Have them sorted early, repairs are often quick and cheap if caught in time.

Suspension Troubles

Potholes take a toll on your suspension. Broken springs or worn shock absorbers might not be obvious until it is too late. If your car leans, bounces too much, or feels loose on corners, get it checked before the MOT.

Exhaust and Emissions

If your car sounds louder than usual or smells odd, your exhaust may have a leak. Failing the emissions test is common, especially with older vehicles or diesels. Make sure your engine is running well and consider a pre-test service or emissions check.

Steering Faults

Free play in the steering wheel or leaking power steering fluid are warning signs. If you notice stiffness or hear knocking when turning, sort it out early. Steering issues are safety risks, and testers don't take them lightly.

Number Plates and Legal Details

Dirty, cracked, or incorrectly spaced number plates are automatic fails. Your car's ID must be easy to read, day or night. Make sure they're clean and meet the rules.

Seatbelt and Airbag Issues

Every seatbelt must click, hold firm, and retract properly. Airbag lights on the dashboard will also trigger a fail. These systems are there for your safety and must be in good working order.

Conclusion

Failing an MOT isn't just about cost, as it also comes with lost time, hassle, and stress. Keeping your car in good shape avoids nasty surprises and keeps everyone safe. Get familiar with the basics, stay on top of checks, and your next MOT could be a smooth pass.