The MOT test is an annual inspection that all cars over 3 years old must undergo in order to be deemed roadworthy and legal to drive on UK roads. Failing an MOT can be inconvenient, costly and in some cases dangerous if faults are not addressed. Here are some of the most common reasons cars fail their MOT:
Worn Out Tyres
Tyres with tread depth under 1.6mm are likely to fail the MOT. Worn tyres provide less grip on the road, take longer to stop in wet conditions and are more prone to punctures. The legal limit is 1.6mm but any tyres under 3mm should be considered for replacement. Check the tread depth across the full width of the tyre, as wear often occurs more on the edges. Uneven wear can indicate tracking/alignment issues.
Faulty Lights
All lights must work properly with the correct colour output. Common failures include blown bulbs, incorrect alignment of headlights, non-functioning brake lights and indicator lights not working or staying on. Dirty lenses over lights can significantly reduce output so ensure they are kept clean.
Brake Issues
The brake pedal should not have excessive travel or feel spongy when a vehicle is presented for an MOT Birmingham. Brakes binding or imbalanced left to right will also fail. There should be no leaks in the system and brake fluid should be filled to the correct level. Brake pads and discs must have sufficient material remaining - disc thickness will be measured. Handbrake mechanism and performance will be assessed.
Suspension Problems
Worn shock absorbers, damaged coils springs, worn bushes and ball joints can be dangerous and will fail the MOT. Listen for knocking noises over bumps and check for fluid leaks. The car should not continue bouncing excessively after hitting a bump.
Exhaust & Emission Faults
The entire exhaust system is checked for leaks and corrosion. Catalytic converters must be present and working properly. Smoke opacity levels of diesel engines are measured. Other emissions control systems are inspected. Issues here lead to excess pollution.
Windscreen Damage
Any damage within the swept area of the wipers that impairs the driver's vision will lead to an MOT failure. Cracks or chips bigger than 10mm are unacceptable. Ensure any repairs are carried out by accredited professionals. Windscreen washers and wipers must operate effectively.
Seatbelts & Doors
All seatbelts must be present, undamaged and operate smoothly. They should lock upon rapid deceleration. Child locks must work on rear doors. Door latches, hinges and mirrors must function properly. Any sharp edges could cause injury.
With regular maintenance and checks, most of these faults can be avoided before the MOT inspection. Address any issues promptly to ensure your vehicle’s safety and roadworthiness.
It is advisable to have your car serviced by a qualified mechanic around 4-6 weeks before the MOT test date. This gives time to identify and repair any potential failures in advance. Consider also checking things like tyre tread, wiper blades and bulbs yourself on a regular basis. Keeping on top of minor faults helps avoid a stressful rush just before the MOT is due.
