Common Reasons Cars Fail Their MOT and How to Avoid Them

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An MOT test is an essential responsibility for car owners in the UK, ensuring vehicles are safe, roadworthy and compliant with legal standards. However, many vehicles fail their MOT on the first attempt due to preventable issues. Understanding the common reasons for failure and taking proactive steps can save you time, money and stress.

Faulty or Non-Functioning Lights

Lighting and signalling issues are among the most frequent causes of MOT failures. This includes non-functioning headlights, brake lights, indicators or sidelights. Often, these are simple issues like a blown bulb or faulty wiring. Regularly inspecting your car’s lights and replacing faulty bulbs in advance can help ensure they’re in working order. Don't forget to check the alignment of your headlights as well, as misaligned lights are often flagged during tests.

Worn or Damaged Tyres

Tyres must meet legal requirements for tread depth. Damage, bulges, or uneven wear can also result in a failed MOT. Regularly inspect your tyres for signs of wear and ensure they are correctly inflated. If in doubt, have a professional check them before your MOT appointment.

Brake Issues

Faulty brakes are a significant reason for MOT failures, as they directly impact safety. Brake pads, discs or callipers showing excessive wear or reduced efficiency can lead to problems. Listen for unusual sounds during braking, such as squealing, and notice if the car takes longer than usual to stop. Have your brakes inspected during routine servicing to detect and address issues early.

Problems With Suspension

Worn or damaged suspension components can also lead to an MOT failure. If you hear knocking noises when driving over bumps or notice reduced handling performance, it’s worth having your suspension inspected. Routine checks can help detect early signs of wear or damage.

High Exhaust Emissions

An increase in exhaust emissions is another common cause of MOT failures, especially with older vehicles. This issue is often linked to a faulty catalytic converter, oxygen sensor or poor maintenance. Using quality fuel, maintaining the correct oil levels, and keeping your vehicle serviced can help lower emission levels.

Tips for Passing Your MOT

To increase the likelihood of passing your MOT, conduct simple maintenance checks regularly. Inspect lights, tyres and windscreen wipers and address small faults promptly. Additionally, keep up with your vehicle’s service schedule and consider pre-MOT checks by a trusted mechanic to identify potential issues before the test.

By staying vigilant and proactive with your car’s maintenance, you can avoid MOT failures and ensure your vehicle is both safe and compliant with UK regulations. For more information, reach out to a professional service like Sahibs Auto Electric.

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