MOT Test: What to Expect

The MOT test, or Ministry of Transport test, is an annual requirement for vehicles in the UK that are three years old or older. It's a crucial check to ensure your vehicle meets the minimum road safety and environmental standards. Many drivers find the MOT process a little daunting, unsure of exactly what their car will be scrutinised for. This guide aims to demystify the MOT, detailing the key components checked and what constitutes a pass or a fail.

Understanding the MOT Test Categories

The MOT test is divided into several key areas, each examining a different aspect of your vehicle's condition. These categories are designed to cover all the essential elements that contribute to a safe and compliant vehicle.

1. Structure and Vehicle Identification

This is the first hurdle your vehicle must clear. The tester will check the general condition of the vehicle's structure. This includes:

• Chassis and Body: The tester will look for excessive corrosion or damage to the chassis, body panels, and subframes. Significant rust, especially in structural areas, can lead to an MOT failure.
• Vehicle Identification Number (VIN): The VIN, usually found on the chassis or dashboard, must be legible and present.
• Doors: Doors must open and close correctly from both the inside and outside.
• Mirrors: All mirrors must be present, securely fitted, and in good condition.
• Bonnet and Boot: These must open and close securely.

2. Fuel System

The fuel system is checked for leaks and proper functioning. This involves:

• Fuel Pipes: No leaks are permitted, and pipes must be securely fastened and free from damage.
• Fuel Filler Cap: The cap must seal properly to prevent fuel evaporation and emissions.

3. Steering and Suspension

A well-functioning steering and suspension system is vital for control and comfort. Checks include:

• Steering System: The tester will check for excessive play in the steering wheel, worn steering components (like track rod ends and ball joints), and any leaks from the power steering system.
• Suspension Components: Shock absorbers, springs, and suspension arms are inspected for damage, leaks, or excessive wear.
• Wheel Bearings: These are checked for excessive play.

4. Wheels and Tyres

This is a common area for MOT failures, so it's essential to keep an eye on your tyres. The following are checked:

• Tyre Tread Depth: The legal minimum tread depth for cars is 1.6mm across the central three-quarters of the tyre's width.
• Tyre Condition: Tyres must be free from cuts, bulges, or other damage.
• Tyre Pressure: While not directly tested for correct pressure, tyres must be inflated appropriately for the vehicle.
• Tyre Size and Type: Tyres must be the correct size and type for your vehicle as specified by the manufacturer.
• Wheels: Wheels must be in good condition and securely fitted.

5. Brakes

The braking system is one of the most critical safety components. The MOT test includes a thorough check of:

• Brake Performance: Using a roller brake tester, the tester measures the effectiveness of both the service brake (foot brake) and the parking brake.
• Brake Fluid: The level should be adequate, and there should be no leaks.
• Brake Lines and Hoses: These must be free from corrosion, leaks, or damage.
• Brake Pads and Discs: Minimum thickness is checked, and they must be free from excessive wear or damage.

6. Lights

All lights on your vehicle must be working correctly and be the correct colour. This includes:

• Headlights: Functionality, aim, and condition are checked.
• Tail Lights, Brake Lights, and Indicators: All must be operational and the correct colour (red for rear lights and brake lights, amber for indicators).
• Number Plate Lights: Must be present and functional.

7. Seatbelts, Seats, and Doors

These are essential for occupant safety:

• Seatbelts: All fitted seatbelts must be present, operational, and free from damage. They are tested for retraction and locking.
• Seats: Front seats must be secure.
• Doors: As mentioned earlier, doors must open and close securely.

8. Exhaust, Emissions, and Fuel

Environmental standards are also part of the MOT:

• Exhaust Emissions: Your vehicle must meet the required exhaust emission standards for its age and type. This is tested using a gas analyser.
• Exhaust System: The exhaust system must be secure, free from leaks, and not excessively noisy.

9. Visibility

The driver's ability to see the road is paramount:

• Windscreen: The condition of the windscreen is checked, particularly for chips or cracks in the driver's line of sight. A chip larger than 10mm in the driver's direct line of sight, or a crack larger than 40mm anywhere on the windscreen, will result in a failure.
• Wipers and Washers: Wipers must effectively clear the windscreen, and the washer system must function to provide water.

10. Other Equipment

Various other components are also inspected:

• Horn: The horn must be working correctly and be audible.
• Speedometer: The speedometer must be working.
• Tyre Pressure Monitoring System (TPMS): If fitted, the TPMS warning light must not be illuminated.
• Battery: The battery must be securely mounted.

MOT Test Failure Categories

Vehicles can fail an MOT for a number of reasons. Failures are categorised into two types:

• Dangerous: A vehicle with a dangerous defect must not be driven on the road until it is repaired.
• Major: A vehicle with a major defect will fail, but it can usually be driven to a place of repair.

The MOT certificate will clearly state any defects found and their category. If your vehicle fails, you'll typically be given a refusal of an MOT test certificate. You'll need to get the necessary repairs done and have the vehicle re-tested.

Preparing for Your MOT

While you can't always predict wear and tear, a few proactive checks can help ensure your vehicle passes its MOT:

• Tyres: Check tread depth and look for any damage or bulges.
• Lights: Ensure all lights are working and bulbs are the correct type.
• Windscreen: Check for any chips or cracks in your line of sight.
• Wipers: Make sure they clear the screen effectively.
• Fluid Levels: Check oil, coolant, and brake fluid levels.
• General Condition: Keep an eye on rust, particularly on structural components.

Frequently Asked Questions

What happens if my car fails its MOT?

If your car fails, you will receive a refusal of an MOT test certificate. You must get the necessary repairs carried out. Depending on the severity of the failure, you may be able to drive the car to a pre-arranged appointment for repair, but it is illegal to drive a car with a dangerous defect on public roads.

Can I get an MOT done early?

Yes, you can get an MOT up to one month before your current MOT certificate expires. The new expiry date will be the same day of the month as the current one, but in the following year.

What is the difference between an MOT and a service?

An MOT is a legal requirement to ensure your vehicle meets minimum safety and environmental standards. A service is a routine maintenance check recommended by the manufacturer to keep your car in good working order and can help prevent problems before they occur.

What are the most common reasons for an MOT failure?

The most common reasons for MOT failure include tyre condition (tread depth and damage), lighting faults, brake issues, suspension problems, and windscreen damage.

By understanding what is checked during an MOT test, you can be better prepared and ensure your vehicle remains safe and roadworthy. Regular maintenance and pre-MOT checks can significantly increase your chances of a first-time pass.