Top MOT Tips to Help Your Car Pass First Time

Car Owl

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Summary

• Simple pre-checks catch common failures: Lights, tyres, and wipers are the top reasons cars fail.
• 40% of failures could be avoided: Many MOT failures are for cheap, easy-to-fix items.
• Book your MOT early: You can test up to one month before expiry without losing any days.

Nobody wants their car to fail its MOT. A failure means extra cost, wasted time, and the hassle of a retest. The good news is that many common failure points are easy to check at home.

Follow these tips to give your car the best chance of passing first time.

Most Common MOT Failures

According to DVSA data, the most common reasons for failure are:

Many of these are cheap and easy fixes. A blown bulb costs £2. A worn wiper blade costs £8. Do not let something so simple cause a failure.

Lights Check

Lighting faults are the single biggest reason for MOT failure. Check all of these:

• Headlights: Both dipped and main beam. Make sure they are aimed correctly.
• Brake lights: Ask someone to press the pedal while you check from behind.
• Indicators: Front, rear, and side repeaters. All must flash at the correct speed.
• Fog lights: Rear fog light must work. Front fog lights are optional but tested if fitted.
• Number plate lights: Both must illuminate the plate clearly.

Tyre Check

Check all four tyres plus the spare (if tested):

• Tread depth: The legal minimum is 1.6 mm across the central three-quarters of the tyre. Use a 20p coin to check. If you can see the outer band, the tread is too low.
• Condition: Look for cuts, bulges, and cracks in the sidewalls.
• Matching: The same type of tyre must be fitted on each axle (both fronts match, both rears match).

Replace tyres at 3 mm rather than waiting until 1.6 mm. Braking distance increases dramatically below 3 mm, especially in the wet.

Windscreen and Wipers

The tester checks your forward visibility:

• Windscreen chips: A chip larger than 10 mm in the driver's swept area (Zone A) is a failure. A chip larger than 40 mm anywhere else in the swept area also fails.
• Wiper blades: Must clear the windscreen without smearing or leaving streaks.
• Washer fluid: The washers must produce a jet of fluid. Top up the washer bottle.

Under the Bonnet

Quick checks before the test:

1. Oil level: Ensure it is between the minimum and maximum marks.
2. Coolant level: Top up if it is low. Do this when the engine is cold.
3. Brake fluid: Check the level in the reservoir.
4. Battery: Terminals should be clean and secure. No visible cracks or leaks.
5. Horn: Press it. It must work. This is an easy fail that many people forget.

Exhaust and Emissions

Emissions are tested on all petrol and diesel cars. To help your car pass:

• Take the car for a 20-minute drive before the test. A warm engine produces cleaner emissions.
• Use the correct grade of engine oil. Wrong oil can raise emissions.
• Make sure the exhaust has no leaks, holes, or excessive corrosion.
• If your car has a DPF, do a motorway run the week before the test.

Check your MOT history for previous emissions results and advisory items.

Other Quick Checks

• Mirrors: All mirrors must be present, secure, and not cracked.
• Seatbelts: Check they click, lock, and retract properly.
• Doors: All doors must open and close securely from inside and outside.
• Registration plates: Must be clean, legible, and correctly formatted.
• Dashboard warning lights: The airbag and engine management lights must not be on.

Pre-MOT Checklist

Print or save this checklist and work through it the day before your test:

1. All external lights working (headlights, brake lights, indicators, fog, number plate).
2. Tyres above 1.6 mm tread depth with no damage.
3. Windscreen free of large chips in the driver's zone.
4. Wipers clear the screen without smearing.
5. Washer fluid topped up and squirting.
6. Horn works.
7. Mirrors present and undamaged.
8. Seatbelts click, lock, and retract.
9. Dashboard warning lights off (airbag, engine).
10. Number plates clean and correctly formatted.

These ten checks take less than 15 minutes and catch the most common failure points.

Final Thoughts

Most MOT failures are preventable with 30 minutes of checking at home. Focus on lights, tyres, wipers, and the windscreen. These account for the majority of failures.

Book your MOT up to one month early to give yourself time for any repairs. And if you are unsure about anything, ask your garage to do a pre-MOT check first.

Read our complete MOT guide for a full breakdown of every test item.

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