What can cause a MOT to fail?
The Ministry of Transport (MOT) test is a crucial examination for vehicles in the UK, ensuring they meet the minimum safety and environmental standards required by law. Every year, millions of cars undergo this test, and while many pass, a significant number fail. Understanding the common causes of MOT failures can help vehicle owners maintain their cars better and avoid the inconvenience and expense of retests. Here are some things what can cause a MOT to fail.
Lights
One of the most common reasons for MOT failure is problems with lights and indicators. This category includes headlights, tail lights, brake lights, and indicator lights. Issues can range from burnt-out bulbs, which are simple yet prevalent, to incorrectly aligned headlights that can blind other drivers or inadequately illuminate the road. Damaged lenses or reflectors can also affect light output and must be replaced to pass the test.
Brakes
The braking system is another critical area where failures frequently occur. This includes the efficiency and performance of the brakes, as well as the condition of the brake pads, discs, and associated components. Brake components naturally wear out over time and need regular checks and replacements. Insufficient brake fluid can lead to reduced braking performance, and the handbrake must hold the car securely on a slope, which is often tested during an MOT.
Suspension
The suspension system ensures a smooth ride and maintains vehicle stability. Common suspension-related MOT failures include worn shock absorbers, which may leak or become ineffective, and broken or damaged coil springs. Additionally, suspension components must not have excessive play, as this can affect handling and safety.
Tyres
Tyres are essential for vehicle safety, providing grip and stability. Tyre issues are a frequent cause of MOT failures. Insufficient tread depth, with the legal minimum in the UK being 1.6mm across the central three-quarters of the tyre, can result in a failure. Cuts, bulges, or cracks in the tyres also need to be addressed. Although less commonly a direct cause of failure, incorrect tyre pressure can highlight other issues or cause uneven wear.
Windscreens
Ensuring clear visibility is vital for safe driving. Visibility-related failures typically involve damaged windscreens, where significant cracks or chips in the driver’s line of sight can cause a failure. Faulty wipers that are worn or ineffective must be replaced, and the washer fluid system must work correctly to clean the windscreen.
Emission system
The exhaust system must be secure and free of serious leaks, and the vehicle must meet emission standards. High levels of emissions can fail the MOT, often indicating engine problems or a faulty catalytic converter. Any significant leaks in the exhaust system can also result in a failure.
Structure
The vehicle’s overall structure must be free from excessive corrosion or damage. Especially in critical areas such as the chassis, suspension mounting points, and seat belt anchorages. Rust in these structural areas can be a major problem, and significant dents, sharp edges, or damage that affects the vehicle’s integrity can also cause a failure.
Steering
The steering system must be in good working order, as it is essential for vehicle control. Issues that might lead to failure include excessive play in the steering wheel and column. If the vehicle is equipped with power steering, the system must operate correctly without leaks.
Seat belts
Seat belts and other restraint systems are crucial for occupant safety. Failures can occur due to damaged seat belts, such as cuts, frays, or weakening, and faulty buckles that do not function correctly or securely latch.
The small things
Even seemingly minor issues like the vehicle’s registration plates can cause a failure. Plates must adhere to the correct format and be clearly legible. Cracked, faded, or dirty plates that obscure the characters can also result in a failure.
Keeping roadworthy
Regular maintenance and pre-MOT checks can help identify and rectify many of the above issues before the test. Thus, reducing the likelihood of failure. By understanding these common causes, vehicle owners can ensure their cars remain roadworthy and compliant with safety standards. Ultimately contributing to safer roads for everyone.
Contact us
Now you have more understanding into What can cause a MOT to fail? Take the time to think about how it will affect you and your vehicle long-term. If you have any questions or are needing an MOT in Rossington, give us a call on 01302 969890 or fill in our contact form.