5 Common MOT Failures and How to Avoid Them

According to DVSA data, around 40% of cars fail their MOT first time. The good news is that many of the most common failure reasons are things you can check yourself before the test — saving you the cost of a re-test.

1. Lighting and Signalling: The single most common MOT failure category. Walk around your car and check every light: headlights, brake lights, indicators, fog lights, reversing lights and number plate lights. Get someone to help you check the brake lights while you press the pedal. Replacing a bulb costs just a few pounds.

2. Tyres: Tyres are checked for tread depth (minimum 1.6mm across the central three-quarters of the tyre), condition, and correct inflation. Check your tread depth with a 20p coin — if the outer band of the coin is visible when inserted into the groove, the tread is likely below the legal limit.

3. Windscreen and Wipers: A chip or crack in the driver's line of sight (Zone A) is an automatic failure. Wipers must clear the screen effectively — replace them if they are smearing or skipping. Washer fluid must also be topped up.

4. Brakes: Brakes are tested for performance and balance. If your car pulls to one side when braking, or the pedal feels spongy, get them checked before your MOT.

5. Suspension and Steering: Worn suspension components are a common advisory or failure point. If you hear clunking over bumps or the car feels vague to steer, have it inspected.

At Watford MOT Centre we carry out free pre-MOT checks on request — just ask when you book. Class 4 MOT from £39. MOT walk-ins are usually welcome — call or WhatsApp 07311 226 868 first to check availability.

💰 Money-saving tip: book your MOT alongside a Full Service for just £15 (instead of £39), or completely FREE when booked with a Major Service.

💰 See our full MOT + Service discount details →

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