The 10 most common MOT failures include lighting issues, suspension faults, brake wear, and tire defects. You can avoid these by performing simple DIY checks on your bulbs, wipers, and tire tread before your test at Boxer Motor Company Ltd, Maidenhead’s trusted Class 4 and Class 7 MOT centre.
Book Your MOT in Maidenhead NowAccording to DVSA data, nearly 30% of vehicles fail their MOT on the first attempt. Many of these failures are for minor issues that could have been fixed in minutes. At Boxer Motor Company in Maidenhead, we see these common faults daily:
Failures due to Lighting & Signaling
Failures due to Suspension issues
Failures due to Brake faults
Blown bulbs for indicators, brake lights, or number plate lights are the single biggest cause of MOT failure. These are often the easiest and cheapest to fix before arriving at our Maidenhead test station.
Issues like leaking shock absorbers or snapped springs are common, especially given the road conditions in Berkshire. Listen for clunking sounds when driving over bumps.
Worn brake pads or an inefficient handbrake will result in an immediate fail. If your car pulls to one side when braking, it needs professional attention.
The legal limit for tread depth is 1.6mm. However, we recommend at least 3mm for safety in wet UK weather. Check for cuts or bulges in the sidewalls.
If your wipers smear the windshield or your screenwash bottle is empty, your car will fail. Ensure your view of the road is unobstructed.
Excessive smoke or a leaking exhaust pipe can lead to failure. For diesel owners in Maidenhead, ensure your DPF is functioning correctly.
Leaking power steering fluid or a heavy steering wheel can indicate a major fault that compromises vehicle safety.
All seatbelts must latch securely and retract fully. Frayed belts are a safety risk and a guaranteed MOT fail.
Dirty, cracked, or incorrectly spaced number plates are common "silly" fails. Ensure your plates meet UK legal standards.
Since 2012, dashboard warning lights (like ABS, SRS, or Engine Management) are part of the MOT. If a light is on, the car fails.
| Component | DIY Check | Professional Fix (Boxer Motor Co) | Failure Risk |
|---|---|---|---|
| Lights | Visual walk-around | Bulb replacement & alignment | High (18.9%) |
| Tyres | 20p coin test | New tyre fitting & balancing | Moderate |
| Brakes | Check fluid levels | Pad/Disc replacement | High (Safety) |
| Emissions | N/A | Diagnostic & Exhaust repair | Moderate |
Turn on all lights and walk around the car. Check the indicators, hazard lights, sidelights, main beams, and fog lights. Don't forget the rear number plate light.
Use a tread depth gauge or a 20p coin to check the tread across the central three-quarters of the tyre. Check for any visible damage or uneven wear.
Wiper blades should be supple and free of tears. If they leave streaks, they need replacing. Also, ensure your screenwash reservoir is topped up to the max.
Give the horn a short blast—it must be loud enough to be heard by other road users. Pull every seatbelt out fully to check for fraying and ensure they click into the buckle.
Ensure all mirrors (interior and exterior) are secure and the glass is not cracked. Clean your front and rear registration plates so they are clearly legible from 20 metres.
The most common reason is faulty lighting and signaling. Many drivers in Maidenhead fail simply because a £2 bulb has blown and wasn't checked before the test.
If your current MOT has expired and the car fails, you can only drive it to a pre-booked repair or a re-test. If the failure is marked as 'Dangerous', you cannot drive it at all.
Class 4 (cars) and Class 7 (large vans up to 3,500kg) have slightly different price points. Boxer Motor Company provides transparent pricing for both classes at our Maidenhead facility.
An MOT typically takes 45 to 60 minutes. We offer a comfortable waiting area for our Maidenhead customers while our certified technicians complete the inspection.
Emissions failures often require a diagnostic check. It could be as simple as a sensor replacement or as complex as a catalytic converter issue. We can advise on the best course of action.
No. Your MOT must be valid at all times. You can book your test up to one month (minus a day) before the expiry date to keep the same renewal date for the following year.
At Boxer Motor Company, we have served the Maidenhead community for years, handling everything from standard family hatchbacks to 5-tonne motorhomes. Our unique insight? Most failures are avoidable. By spending 10 minutes checking your lights and fluids, you save yourself the stress of a "Fail" certificate and the cost of a re-test.
Our facility is an authorised centre offering Class 4 and Class 7 MOTs, making us one of the few locations in Maidenhead capable of testing larger pickups, horseboxes, and minibuses.
Book Your Class 4 or 7 MOT Today