MOT Test: What It Covers

Understanding the MOT Test: A Comprehensive Guide

The MOT (Ministry of Transport) test is an annual inspection of your vehicle's condition, ensuring it meets road safety and environmental standards. It's a crucial part of keeping your vehicle legal to drive and, more importantly, safe for you and others on the road. Many drivers wonder exactly what gets checked during this vital examination. This guide will delve into the various components and systems that the MOT test scrutinises, providing a clear understanding of what to expect.

The Core Areas of the MOT Test

The MOT test is divided into several key areas, each focusing on a specific aspect of your vehicle's safety and compliance. These are broadly categorised as follows:

1. Identification of Vehicles

This initial stage ensures that the vehicle presented for testing is indeed the vehicle it is supposed to be. Checks include:

• VIN (Vehicle Identification Number): The VIN, usually found on the chassis or dashboard, must be present, legible, and match the vehicle's registration documents.
• Chassis Number: Similar to the VIN, this must be clearly visible.
• Engine Number: The engine number should also correspond with the documentation.

2. Body and Vehicle Structure

The structural integrity of your vehicle is paramount for safety. The tester will meticulously examine:

• Chassis: Look for significant corrosion, damage, or distortion that could compromise the vehicle's strength.
• Body Panels: Check for excessive rust, sharp edges, or damage that could be hazardous.
• Doors: Ensure doors open, close, and lock correctly from both the inside and outside.
• Bonnet: The bonnet must be securely fastened and openable for inspection.
• Boot/Tailgate: Similar to doors, these must function correctly.
• Seats: Front seats must be secure and adjustable.
• Seatbelts: All fitted seatbelts must be present, correctly anchored, and in good working order, including the webbing and locking mechanism.
• Mirrors: The condition and security of mirrors are checked.
• Windscreen: The view of the driver must not be significantly obscured by chips or cracks. A crack over 40mm or 75mm in the driver's line of sight will result in a failure.
• Wipers and Washers: These must be in good working order to clear the windscreen effectively.
• Horn: The horn must be fitted and operational.

3. Lighting Equipment

Proper lighting is essential for visibility and signaling. The MOT tester will check:

• Headlights: Functionality, aim (both dipped and main beam), and condition.
• Tail Lights: Functionality and condition.
• Brake Lights: Functionality, ensuring they illuminate when the brake pedal is pressed.
• Indicator Lights: Functionality and synchronisation.
• Daytime Running Lights: If fitted, they must be operational.
• Registration Plate Lamps: Must be present and working to illuminate the rear number plate.

4. Ball-Joints, Suspension, and Shock Absorbers

These components are critical for handling and stability:

• Suspension Components: Check for wear, damage, or corrosion that could affect road holding. This includes shock absorbers, springs, and suspension arms.
• Ball Joints: Must be free from excessive play.
• Wheel Bearings: Checked for excessive play.

5. Wheels and Tyres

The condition and suitability of your tyres and wheels are thoroughly inspected:

• Tyre Tread Depth: Must be at least 1.6mm across the central three-quarters of the breadth of the tread.
• Tyre Condition: No cuts, bulges, or damage that could be dangerous.
• Tyre Size and Type: Must be appropriate for the vehicle and fitted correctly (e.g., matching tyres on the same axle).
• Wheel Condition: Check for damage or distortion.
• Wheel Nuts/Bolts: Must be present and secure.

6. Brakes

A comprehensive check of your braking system is performed:

• Brake Performance: Measured on a rolling road to ensure sufficient stopping power.
• Brake Pedal: Must feel firm and not sink to the floor.
• Brake Fluid: Level and condition are checked.
• Brake Lines and Hoses: Checked for leaks, corrosion, or damage.
• Parking Brake: Must operate effectively.
• ABS Warning Light: Must illuminate on ignition and then go out, or function correctly if it's a fault indicator.

7. Steering and Suspension

Beyond the ball joints, steering and suspension components are vital:

• Steering System: Checked for excessive play or stiffness.
• Power Steering: Any leaks or faults are noted.
• Shock Absorbers: Tested for effectiveness and leaks.

8. Exhaust Emissions

Environmental standards are a key part of the MOT:

• Exhaust Emissions: The vehicle must meet the emissions standards for its age and fuel type. This is tested using an emissions analyser.
• Exhaust System: Checked for leaks, corrosion, security, and condition.

9. Fuel System

The fuel system is checked for integrity and safety:

• Fuel Lines: Checked for leaks or damage.
• Fuel Tank: Checked for leaks or damage.
• Fuel Cap: Must be present and secure.

10. Other Components

Several other critical systems are also examined:

• Engine: While the engine's internal workings aren't tested, the engine mountings are checked for security.
• Transmission: Checked for leaks.
• Clutch: Checked for operation and leaks.
• Speedometer: Must be present and working.
• Cooling System: Checked for leaks.

What Doesn't the MOT Test Cover?

It's important to understand that the MOT test is not a full service. It focuses on safety and emissions. The following are typically NOT covered:

• Engine, Gearbox, and Clutch: Wear and tear on these major mechanical components are not assessed unless they pose an immediate safety risk (e.g., a leaking gearbox).
• General Mechanical Condition: Minor oil leaks, worn but still functioning components, or general wear and tear that doesn't affect safety or emissions are usually outside the scope of the MOT.
• Battery: The condition or charge of the battery is not tested.
• Tyre Wear (Minor): While tread depth is checked, minor wear that doesn't fall below the legal limit is acceptable.
• Bodywork (Minor): Minor cosmetic damage or small rust spots that don't affect structural integrity are generally overlooked.

Common Reasons for MOT Failure

Understanding what's checked helps in anticipating potential failure points. Common reasons for failing an MOT include:

• Tyre Tread Depth: Below the legal limit.
• Lights: Malfunctioning headlights, brake lights, or indicators.
• Brakes: Poor brake performance or worn brake pads/discs.
• Windscreen: Significant chips or cracks in the driver's line of sight.
• Suspension: Worn ball joints or shock absorbers.
• Exhaust Emissions: Failing to meet the required standards.
• Visibility: Faulty wipers or washers, or obscured mirrors.
• Structural Integrity: Excessive corrosion or damage to the chassis or body.

Preparing Your Vehicle for its MOT

To maximise your chances of a successful MOT, consider these pre-test checks:

• Tyres: Ensure they meet the legal tread depth and are free from damage.
• Lights: Check all lights are working correctly.
• Windscreen: Clean it thoroughly and check for any chips or cracks.
• Wipers and Washers: Ensure they function effectively.
• Horn: Test that it works.
• Fluid Levels: Check brake fluid, coolant, and screenwash levels.
• Bodywork: Address any sharp edges or significant rust.

The MOT Certificate

Upon passing the MOT, you will receive a VT20 (pass) certificate. If your vehicle fails, you will receive a VT30 (refusal of an MOT test certificate). A vehicle that fails the MOT test must not be driven on the road, except to a pre-arranged repair or to a pre-arranged MOT test. You have a period of 10 working days to rectify the issues and have the vehicle retested.

Conclusion

The MOT test is a comprehensive safety check designed to ensure your vehicle is roadworthy. By understanding what is inspected, you can better prepare your vehicle and avoid common failure points. Regular maintenance, beyond just the MOT, is key to keeping your car safe and reliable throughout the year.

Frequently Asked Questions (FAQs)

Q1: How often do I need an MOT?
A1: For most cars, the first MOT is due when they are three years old. After that, it needs to be renewed annually.

Q2: Can I drive my car if it fails its MOT?
A2: You can only drive your car if it has a valid MOT certificate or if you are driving it to a pre-arranged repair appointment or a pre-arranged MOT test appointment. Driving a car that requires an MOT but doesn't have one is illegal.

Q3: Does the MOT test check the engine?
A3: The MOT does not check the internal workings or the overall mechanical condition of the engine. It primarily focuses on safety aspects, such as engine mountings and leaks.

Q4: What is the minimum tyre tread depth for an MOT?
A4: The legal minimum tyre tread depth in the UK is 1.6mm across the central three-quarters of the tyre's breadth.

Q5: What happens if my car fails the MOT?
A5: If your car fails, you will receive a refusal of an MOT test certificate outlining the reasons for failure. You must have the necessary repairs carried out and then have the vehicle retested. You can have the repairs done and then get a partial re-test, which may be free or discounted depending on the garage and when the re-test is conducted.

Q6: Is the MOT a service?
A6: No, the MOT is a mandatory safety inspection, not a routine service. A service involves checks and replacement of fluids, filters, and parts based on mileage or time, whereas the MOT focuses solely on roadworthiness and emissions.

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