Common Reasons Cars Fail Their MOT and How to Avoid Them

The MOT (Ministry of Transport) test is a crucial requirement for vehicles over three years old in the UK. Designed to ensure that vehicles meet safety and environmental standards, an MOT can be a source of anxiety for many drivers. Knowing the common reasons cars fail their MOT and how to avoid these pitfalls can save you time, money, and the frustration of unexpected repairs. In this blog, we’ll delve into the most frequent issues that lead to MOT failures and provide actionable tips to help you keep your vehicle in top condition.

1. Lights and Indicators

One of the simplest yet most common reasons for MOT failure is faulty lights. Whether it’s a blown bulb in your headlights, brake lights, or indicators, failing to check your lights before the test can lead to an immediate fail. During the MOT, testers will check not just the functionality of the lights but also their alignment.

How to Avoid This Issue:

• Regularly Inspect Your Lights: Make it a habit to check all lights, including indicators and hazard lights, at least once a month.

• Replace Faulty Bulbs Promptly: If you notice any lights out, replace them as soon as possible.

• Seek Professional Help for Alignment: If your headlights are misaligned, a quick visit to a garage can resolve this before your MOT.

2. Tires

Worn or damaged tires are another major cause of MOT failures. The legal minimum tread depth in the UK is 1.6mm, but for optimal safety, it’s recommended to aim for at least 3mm. Additionally, tires should be free from significant damage such as cuts, bulges, or punctures.

How to Avoid This Issue:

• Check Tire Pressure and Tread Depth Regularly: Invest in a tire depth gauge to monitor your tread depth, and ensure your tire pressure is within the recommended range.

• Rotate Your Tires: Regular tire rotation can help with even wear and extend their lifespan.

• Replace Worn Tires: Don’t wait until your tires are close to the legal limit; replace them when they show signs of significant wear.

3. Brakes

Braking issues are serious safety concerns and a common reason for MOT failures. Testers will check for sufficient brake pad thickness, the condition of the brake discs, and the functionality of the handbrake.

How to Avoid This Issue:

• Listen for Warning Signs: Pay attention to any unusual noises when braking, such as squeaking or grinding.

• Check Brake Fluid Levels: Ensure your brake fluid is at the recommended level and change it according to your vehicle’s maintenance schedule.

• Schedule Regular Brake Inspections: Have your brakes checked by a professional at least once a year, especially if you notice any performance issues.

4. Emissions

With growing concerns over environmental issues, emissions testing has become stricter. If your vehicle fails to meet the required emissions standards, it will fail the MOT. Common reasons for high emissions include engine issues, exhaust system faults, and using the wrong fuel type.

How to Avoid This Issue:

• Keep Up with Servicing: Regular servicing can help identify potential issues before they lead to MOT failures.

• Use the Right Fuel: Always use the fuel recommended by your manufacturer to prevent unnecessary emissions.

• Monitor Engine Performance: If you notice a drop in performance or a warning light on the dashboard, have it checked out immediately.

5. Suspension and Steering

A well-functioning suspension and steering system is crucial for vehicle safety. MOT testers will inspect for any excessive play in the steering, as well as the condition of the shock absorbers and springs.

How to Avoid This Issue:

• Check for Unusual Noises: Listen for clunks or rattles when driving, which may indicate suspension issues.

• Look for Signs of Wear: Inspect shock absorbers for any leaks or damage.

• Get Regular Alignments: Having your wheels aligned can prevent premature wear on your suspension components.

6. Windscreen and Wipers

A cracked windscreen or faulty wipers can also lead to an MOT failure. Any damage to the driver’s line of sight can be a cause for concern.

How to Avoid This Issue:

• Inspect Your Windscreen Regularly: Check for any cracks or chips, especially before the MOT. If the damage is large or directly in the driver’s view, it may need repair or replacement.

• Test Your Wipers: Ensure your wipers are functioning properly and replace them if they leave streaks or don’t clear the windscreen effectively.

7. Bodywork and Structural Integrity

While this may not be the first thing you think of, bodywork can also affect your MOT results. Rust, corrosion, and any major dents that compromise the structural integrity of the vehicle can lead to a failure.

How to Avoid This Issue:

• Perform Regular Inspections: Check your vehicle for any signs of rust or damage and address these issues early.

• Keep It Clean: Regular washing can help prevent rust, especially in winter when road salt can cause corrosion.

• Use Protective Coatings: Consider applying rustproof coatings or treatments, especially if you live in an area prone to heavy snowfall and salt.

Conclusion

Understanding the common reasons cars fail their MOT can empower you to take proactive measures and ensure your vehicle passes the test with flying colors. Regular maintenance, inspections, and timely repairs are key to avoiding these pitfalls. By being diligent and informed, you can enjoy peace of mind knowing that your vehicle is safe, reliable, and compliant with MOT standards. Don’t wait for the test date to make these checks; incorporate them into your regular vehicle maintenance routine to keep your car in the best shape possible.