Common MOT Fails: Lights, Shields, and Your Car

The annual MOT test is a rite of passage for every vehicle owner in the UK, a necessary hurdle to ensure our cars are roadworthy and safe. Yet, for many, it's a source of anxiety, with worries about unexpected failures and the cost of repairs. Understanding the common reasons vehicles fail can significantly reduce this stress, allowing you to address potential issues before your test date. This article delves into frequently asked questions regarding specific MOT concerns, from lighting anomalies to missing components, providing clarity on what constitutes a fail and how to prepare your vehicle effectively.

Passing your MOT isn't just about avoiding a retest fee; it's fundamentally about ensuring the safety of your vehicle for yourself, your passengers, and other road users. A thorough understanding of the MOT regulations can save you time, money, and potentially, lives.

Will My 2013 Volvo V40 Offside Daytime Running Light Fail a MOT?

Daytime Running Lights (DRLs) are designed to make your vehicle more visible during daylight hours. For your 2013 Volvo V40, the presence and functionality of DRLs are indeed subject to MOT scrutiny, though the specific criteria can sometimes be a little nuanced. Generally, if DRLs are fitted as original equipment to a vehicle, they must be in working order and conform to the required standards.

Specifically, if your offside (driver's side) DRL is not working, it will likely constitute a failure during an MOT. The MOT test manual states that all lamps, reflectors, and associated equipment must be:

• Fitted securely
• Not obscured
• Not discoloured
• Not adversely affected by the operation of any other lamp
• Clean and in good working order

While DRLs are not strictly part of the mandatory lighting regulations for all vehicles in the same way headlights or brake lights are, if they are fitted, they are expected to function correctly. An inoperative DRL on one side could be considered a defect that affects the vehicle's overall visibility and symmetry, potentially leading to a 'major' defect and thus an MOT failure. It's always best practice to ensure all lights on your vehicle are fully operational before presenting it for inspection.

Is a Missing Heat Shield an MOT Failure?

Heat shields play a crucial role in your vehicle's safety and longevity. Their primary function is to protect sensitive components from the extreme heat generated by the exhaust system, catalytic converter, or other engine parts. These components can reach very high temperatures, and without adequate shielding, they could cause damage to fuel lines, brake lines, electrical wiring, or even ignite flammable materials under the vehicle.

The question of whether a missing heat shield constitutes an MOT failure depends on its specific location and the potential risk it poses. If the rear heat shield (or any other heat shield) is missing, it is likely to result in an MOT failure if the examiner deems it presents a fire risk or could cause damage to other vehicle components. The MOT inspection includes checking for items that could pose a risk to safety or cause excessive noise. A missing heat shield that exposes vital components to excessive heat clearly falls under this category.

Common areas where heat shields are found and their absence could lead to a fail include:

• Above the exhaust system, particularly near the catalytic converter.
• Protecting the fuel tank or fuel lines.
• Shielding brake lines or brake components.

Even if no immediate damage is evident, the potential for future failure or fire risk is enough for a 'major' defect. It's a relatively inexpensive repair compared to the damage it prevents, so it's highly advisable to replace any missing or damaged heat shields promptly.

My Car Has Failed Its MOT on One Rear Fog Light Not Working - Can It Pass With Just One?

This is a common point of confusion for many motorists, and the answer depends on how many rear fog lights your car was originally designed to have. In the UK, vehicles are legally required to have at least one working rear fog lamp. For most cars manufactured for the UK market, only one rear fog light is fitted, typically on the offside (driver's side) of the vehicle. This is to prevent confusion with brake lights, especially in poor visibility conditions, and to provide the maximum warning to following drivers from the side closest to the centre of the road.

Therefore, if your Rover 75 (or any other car) was originally manufactured with only one rear fog light (which is highly probable for a UK-spec vehicle), and that single light is not working, it will indeed fail the MOT. However, if your car was designed and fitted with two rear fog lights (common on some European imports or specific models), and only one is working, this would also constitute an MOT failure. The key principle is that any lamp fitted must be fully operational if it's part of the vehicle's original design or a legal requirement.

To check if your Rover 75 has one or two rear fog lights, simply:

• Turn on your ignition and engage the rear fog lights.
• Walk around the back of your car.
• Observe how many lights illuminate.

If only one illuminates and it's on the offside, your car likely only has one. If two illuminate, then both must be working for an MOT pass. The MOT manual clearly states that 'where more than one rear fog lamp is fitted, all must be working correctly and emit light of substantially the same colour and intensity.'

Summary of Lighting Requirements for MOT

General MOT Preparation and Common Failures

Beyond the specific issues discussed, a significant number of MOT failures stem from easily preventable problems. A proactive approach to vehicle maintenance can drastically improve your chances of passing the first time. Here's a broader look at common failure points and how to check them:

Tyres

Tyres are a frequent cause of MOT failure. Examiners will check:

• Tread Depth: The legal minimum tread depth is 1.6mm across the central three-quarters of the tread around the entire circumference of the tyre. Many failures occur due to insufficient tread.
• Condition: Look for cuts, bulges, or cords exposed on the sidewalls or tread. Damage to the tyre structure is an immediate fail.
• Inflation: While not a direct fail point, incorrect tyre pressure can affect handling and wear, leading to other issues.

Brakes

Brake system defects are critical safety failures. The MOT test checks:

• Efficiency: Brakes must meet minimum performance standards.
• Condition: Look for worn brake pads/discs, leaks in brake lines, or seized calipers.
• ABS Warning Light: If the ABS warning light is on, it's an automatic fail.
• Handbrake: Must hold the vehicle securely.

Suspension

Problems with suspension components can affect handling and vehicle control:

• Shock Absorbers: Leaks or excessive bounce indicate worn shocks, which is a fail.
• Springs: Broken or corroded springs are a common failure.
• Ball Joints/Bushes: Excessive play in these components indicates wear.

Windscreen and Wipers

Your field of vision is paramount:

• Chips/Cracks: Any damage larger than 10mm in the 'A' zone (directly in the driver's line of sight) or 40mm elsewhere in the swept area will fail.
• Wipers: Must clear the screen effectively. Blades that smear or leave streaks will fail.
• Washers: Must provide enough fluid to clear the screen.

Exhaust System

A faulty exhaust can lead to both noise and emissions issues:

• Leaks: Any significant leak in the exhaust system is a fail.
• Security: The exhaust must be securely mounted; loose or corroded hangers can cause issues.
• Emissions: The car must meet specific emissions standards for its age.

Steering

Excessive play or looseness in the steering components is a serious safety concern:

• Steering Rack/Box: Excessive play.
• Power Steering: Fluid leaks or low fluid levels.
• Steering Wheel: Excessive free play.

Pre-MOT Checks You Can Do

Before your MOT appointment, take an hour to perform some simple checks yourself:

1. Lights: Check all exterior lights (headlights, indicators, brake lights, rear lights, fog lights, number plate lights) are working, clean, and correctly coloured. Get someone to help you check brake lights.
2. Tyres: Check tread depth, look for bulges or cuts, and ensure pressures are correct.
3. Wipers & Washers: Test wipers for effectiveness and ensure washers spray adequately. Top up washer fluid if needed.
4. Horn: Give it a quick blast to ensure it works.
5. Mirrors: Ensure all mirrors are secure and provide a clear view.
6. Seatbelts: Pull each seatbelt out fully to check for fraying or damage, and ensure they latch and retract correctly.
7. Fluid Levels: Check oil, coolant, brake fluid, and power steering fluid levels.
8. Dashboard Warning Lights: Ensure no persistent warning lights (e.g., engine, ABS, airbag) are illuminated.
9. Exhaust: Listen for any unusual loud noises or rattles from the exhaust.
10. Number Plates: Ensure they are clean, legible, and not obscured.

Frequently Asked Questions About MOTs

Can I drive with a failed MOT?

No, generally not. If your car fails its MOT, it is no longer legally roadworthy and cannot be driven on public roads except for two specific circumstances: to a pre-booked appointment for repairs required to pass the MOT, or to a pre-booked MOT retest. Driving a vehicle without a valid MOT can result in a fine of up to £2,500, points on your licence, and potential invalidation of your insurance.

What if my car fails its MOT?

If your car fails, you will receive a 'Refusal of an MOT Test Certificate' document. This document will list all the defects. You have a few options:

• Get repairs done at the test centre: If they offer repair services, you might get a free retest if repairs are completed within 10 working days.
• Take it elsewhere for repairs: If you take it to another garage, you'll need to arrange a full retest, which will incur another fee.
• Partial retest: If the vehicle is left at the test centre for repairs and retested within 10 working days, or if you take it away and return it within one working day for certain minor defects, you might only need a partial retest, which could be free or at a reduced cost.

How long is an MOT certificate valid?

An MOT certificate is valid for 12 months from the date it was issued. You can have your car tested up to one month (minus a day) before your current MOT certificate expires and still keep the same renewal date. For example, if your MOT expires on 15th May, you can get it tested from 16th April and the new certificate will run until 15th May the following year.

Do electric cars need an MOT?

Yes, electric vehicles (EVs) are subject to the same MOT requirements as petrol or diesel cars once they are three years old. While they don't have an exhaust system to check for emissions, the MOT test still covers all other critical safety and roadworthiness aspects, including brakes, tyres, lights, steering, suspension, and vehicle structure.

Understanding the intricacies of the MOT test can transform it from a dreaded annual event into a manageable part of your vehicle maintenance routine. By taking the time to perform basic checks and addressing any issues proactively, you can significantly increase your chances of a first-time pass, ensuring your vehicle remains safe, compliant, and ready for the road ahead.

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