Top Reasons Why Cars Fail Their MOT – And How to Avoid Them

Keeping your car roadworthy isn’t just a matter of convenience; it’s a legal requirement. Every year, thousands of vehicles in the UK fail their MOT test due to avoidable issues. Understanding the common reasons for MOT failures can help you prepare better and save money on retests and repairs. Here are the top reasons cars fail their MOT—and how you can avoid them.

1. Faulty Lights and Signalling

Lighting issues account for a significant number of MOT failures in the UK. This includes problems with headlights, brake lights, indicators, and even registration plate lights.

How to avoid it: Before booking your MOT, walk around your car and check all lights. Ask a friend to help you test brake lights and indicators. Replace any faulty bulbs immediately.

2. Worn-Out Tyres

Tyres are another major culprit. The legal tread depth in the UK is 1.6mm, and tyres below this threshold will fail the test. Uneven wear or visible damage also leads to failure.

How to avoid it: Use a tread depth gauge or the 20p coin test to ensure your tyres meet the legal standard. Regularly check tyre pressure to prevent uneven wear.

3. Brake Issues

Brakes play a crucial role in safety and are thoroughly inspected during an MOT. Worn brake pads, damaged discs, or leaking brake fluid are common causes of failure.

How to avoid it: If you notice squeaking sounds, longer stopping distances, or a soft brake pedal, have your brakes inspected and serviced before your MOT.

4. Windscreen Problems

Cracks or chips on your windscreen, particularly in the driver’s line of vision, can cause an MOT failure. Faulty wipers or insufficient washer fluid can also be an issue.

How to avoid it: Repair any chips before they spread and replace worn-out wipers. Check and top up washer fluid before your MOT test.

5. Exhaust and Emissions

Excessive exhaust emissions or a noisy exhaust system often lead to MOT failures. This is especially common in older vehicles.

How to avoid it: Ensure your car is serviced regularly, and consider an engine check if you notice increased smoke or noise. Using quality fuel and maintaining your catalytic converter can also help.

Final Thoughts

Failing your MOT can be inconvenient and costly, but most issues are preventable with regular maintenance. By performing simple checks on your lights, tyres, brakes, and windscreen before the test, you can increase your chances of passing the first time.

For a quick and easy MOT booking, visit checkmot.com. Enter your registration number to find local MOT centres, book online, and even check your MOT history. Stay ahead of problems and keep your car roadworthy today!