The Most Common Reasons Cars Fail MOT Tests in the UK

Nobody wants to hear that their car has failed its MOT, especially when it’s something that could’ve been sorted with a quick check. Yet, year after year, thousands of vehicles fall short for the same avoidable reasons. 

These aren't complicated faults or major breakdowns, but everyday issues that drivers often miss. If you want to avoid the stress, cost, and inconvenience of a failed test, keep reading to see what might be catching others out.

Faulty Lights and Indicators

Lighting problems are one of the top reasons for MOT failures. Blown bulbs, broken lenses, or faulty indicators are often picked up during the inspection. These are usually easy to fix at home with a new bulb or fuse, yet they still catch many drivers out.

You’ll want to make sure all external lights work correctly, especially before booking your MOT in Birmingham or any other location where traffic checks are common.

Tyre Wear and Damage

Tyres are your car’s only contact with the road, and their condition is closely checked during the MOT. The minimum legal tread depth is 1.6mm, but many experts recommend changing tyres before they reach that point for safety.

Excessive or uneven wear, sidewall damage, or incorrect pressure can all lead to a failure. Cold weather and potholes often make things worse, so inspect your tyres often, especially before the winter season.

Brake Issues

A car with poor brakes won’t pass. The MOT test checks brake performance and condition, and even minor faults like thin brake pads or leaking fluid can cause a fail.

If your car takes longer to stop, the pedal feels spongy, or you hear grinding sounds, there’s a good chance your brakes need attention. Keeping this system in top condition is vital for both passing the MOT and for everyday safety.

Suspension and Steering Problems

Bumpy rides can be a sign of worn shock absorbers, damaged springs, or looseness in the steering system. All of these can lead to a failed test.

Mechanics will often shake down your car’s suspension during the MOT, checking for play and leaks. If your vehicle makes clunking sounds when turning or feels unstable on uneven roads, it might be time to have it looked at.

Windscreen and Wiper Faults

A clear view is essential. MOT rules state there should be no significant chips or cracks in the driver’s line of sight. Your wipers also need to work properly and clean the screen effectively. Make sure the washer fluid is topped up and that the blades sweep cleanly. It’s an easy check that’s often overlooked, but it can be a deal-breaker at test time.

Conclusion

A failed MOT isn’t always about big repairs. It’s often small, fixable issues that slip through unnoticed. Checking these areas ahead of your appointment can save time, stress, and money.

Be proactive and give your car a quick once-over before test day. A little preparation now can spare you the hassle of booking a second MOT later.