What to Check Before Your MOT:
A DIY Guide for Beginners

 

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Your car’s MOT test doesn’t have to be a stressful experience — especially if you prepare in advance. While some issues are best left to mechanics, there are several simple checks you can do yourself to increase the chances of passing on the first try. This beginner-friendly DIY guide will walk you through the most common things to check before your MOT, saving you time, money, and hassle.

Why Do a Pre-MOT Check?

An MOT (Ministry of Transport) test is a legal requirement in the UK for vehicles over three years old, ensuring they meet road safety and environmental standards. Failing an MOT can result in costly repairs and even driving restrictions. By spotting minor issues beforehand, you can take action early — often avoiding test failure.

1. Lights & Indicators

What to check:

• Headlights (both dipped and full beam)
• Tail lights
• Brake lights
• Indicators (front, back, and side)
• Number plate lights

Tip: Have someone help you check brake and reverse lights while you operate the controls.

 

2. Tyres & Tread Depth

What to check:

• Minimum 1.6mm tread depth across the central three-quarters of the tyre.
• No visible cuts, bulges, or damage.
• Tyres inflated to correct pressure.

Use a 20p coin to check tread depth — if you can see the outer band of the coin, your tread may be too low.

 

3. Windscreen, Wipers & Washer Fluid

What to check:

• No major cracks or chips in the windscreen (especially in the driver’s line of sight).
• Wipers are in good condition and don’t leave streaks.
• Washer jets are working.
• Washer fluid is topped up.

A faulty washer jet or empty tank can result in a fail — it’s an easy fix!

 

4. Brakes

What to check:

• Listen for squeaks or grinding when braking.
• Car doesn’t pull to one side when braking.
• Brake pedal feels firm, not spongy.

You can’t test everything yourself, but you can detect unusual behaviour early and get it checked.

 

5. Seatbelts & Seats

What to check:

• All seatbelts buckle and unbuckle properly.
• Belts fully retract and have no fraying or damage.
• Driver’s seat can adjust and lock into position.

 

6. Exhaust System

What to check:

• No loud noises or excessive smoke from the exhaust.
• No rattling sounds underneath the car.
• Look for visible damage or corrosion if safe to check.

 

7. Horn

What to check:

• Press the horn — it should be loud and work consistently.

 A faulty horn is a common (and easily avoidable) MOT fail.

 

8. Number Plates

What to check:

• Plates are clean, clearly visible, and securely attached.
• Characters are the correct size and font.
• No cracks or damage.

 

9. Mirrors

What to check:

• All mirrors (interior and exterior) are intact and secure.
• No cracks or obstructed views.

 

10. Dashboard Warning Lights

What to check:

• When you turn the ignition on, all warning lights should come on briefly, then go out.
• If any lights (like engine management, ABS, or airbag) stay on, get it checked before your MOT.

 

Final Tips Before the Test

• Clean your car, inside and out. A cluttered or dirty vehicle can result in a refusal to test.
• Bring your documents (though most garages can access them online).
• Book early, especially during busy times of the year.

Doing a few basic checks before your MOT can make all the difference. Not only can you save money on retests and repairs, but you’ll also drive away with greater peace of mind. Many of these tasks take just minutes — and no tools or technical know-how needed! Ready to book your MOT? After your DIY check, head to your trusted garage and get your car tested with confidence.

Article posted on: 21 October 2025. Author: Megan

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