MOT Failures: Minor vs. Major

Navigating the world of vehicle inspections, particularly the MOT test, can sometimes feel like deciphering a foreign language. For many car owners, the distinction between a 'minor' fault and a 'major' one, or understanding the implications of an 'advisory', can be a source of confusion. This is especially pertinent when you're eyeing a used car, where the MOT history can be a crucial indicator of its condition. Let's delve into what these terms truly mean in the context of a UK MOT test and how they might influence your purchasing decisions.

Understanding MOT Classifications

The Driver and Vehicle Standards Agency (DVSA) categorises issues found during an MOT test into three main types: Dangerous, Major, and Minor. Each classification has a specific implication for the vehicle's immediate roadworthiness and the actions required.

Dangerous Faults

These are the most serious. A vehicle with a dangerous fault is prohibited from being driven on the road. If such a fault is identified, the MOT certificate will be refused, and the vehicle must be repaired and re-tested. Examples include defective brakes, steering issues, or corroded suspension components that could lead to a catastrophic failure.

Major Faults

Major faults mean the vehicle has a defect that could have a significant impact on safety, the environment, or the vehicle's performance. While not immediately dangerous, the vehicle will fail its MOT if these are present. These faults require repair, and the vehicle must be re-tested to pass. Common major faults include issues with the exhaust system, tyre tread depth below the legal limit, or a malfunctioning anti-lock braking system (ABS) warning light.

Minor Faults

This is where the initial query lies. A minor fault is a defect that is not too serious to cause immediate danger or have a significant impact on the vehicle's safety or environmental performance. Crucially, a vehicle with only minor faults will still pass its MOT test. However, the tester is obliged to record these minor faults and advise the owner that they should be repaired at some point. Think of them as early warnings.

What are MOT Advisories?

The term 'advisory' is often used interchangeably with 'minor fault', but it's more precisely a note made by the tester about potential future problems. An MOT advisory is a recommendation for maintenance or repair that isn't severe enough to cause an immediate MOT failure. These are often related to wear and tear that hasn't yet reached a critical level. Examples include:

• Slight corrosion on the suspension components.
• Worn, but not yet illegal, tyre tread.
• Minor oil leaks (as mentioned in your query).
• Slight play in steering or suspension components.
• Worn shock absorbers (but not leaking or adversely affecting handling).

Receiving advisories doesn't mean your car has failed. It means the tester has identified areas that might need attention in the near future. It's a proactive measure to help you maintain your vehicle and prevent more serious issues (and potentially costly repairs) down the line.

The Case of the 'Engine and Under Covers Fitted' Minor

You've highlighted a specific point: a recent MOT showing a 'minor' fault for 'Engine and under covers fitted', which wasn't present in previous MOT records. You're concerned that this might have been fitted by the owner to conceal potential issues from the MOT tester, given that testers are generally not allowed to remove these covers.

This is a very astute observation. Under-trays, also known as engine shields or undertrays, are designed to protect the underside of the vehicle from road debris, water, and dirt. They can also play a role in aerodynamics and noise reduction. However, they can also obscure certain components from view, including parts of the engine, exhaust, suspension, and steering systems.

The DVSA's guidelines for MOT testers are clear. While testers are expected to inspect as much of the vehicle as possible, they are generally not required to remove under-trays or other panels if they are securely fastened and not obviously damaged or contributing to a dangerous condition. If a tester cannot adequately inspect a component because it's covered by an under-tray, they may have to fail the vehicle on the grounds that they cannot ascertain its condition. Alternatively, if the under-tray itself is damaged or insecure, this could be noted as a fault.

In the scenario you've described, the 'minor' fault being listed as 'Engine and under covers fitted' could indeed be interpreted in a few ways:

1. The under-trays were found to be insecure or damaged: If the covers themselves were loose, hanging down, or had significant damage, this would be a valid reason for a minor (or even major) fault.
2. The under-trays prevented inspection: If the tester could not properly inspect critical components due to the presence of the under-trays, they might record this as a minor issue, essentially flagging that these covers are present and potentially obscuring vital parts. This is less common than failing for inability to inspect, but not impossible.
3. A misunderstanding or misinterpretation of the fault code: It's possible there's a standard way testers record the presence of under-trays that might be misinterpreted. However, the wording 'minor' suggests it's not a failure point in itself.
4. An attempt to 'pass' the vehicle: Your suspicion is valid. If the owner had previously received advisories or failures related to components hidden by these covers (e.g., minor oil leaks, exhaust mounting issues), fitting new or re-securing existing under-trays could indeed be an attempt to prevent the tester from seeing those issues again. The 'minor' fault might simply be the tester noting the presence of the covers as a potential impediment to future inspections, or if the covers themselves were deemed to be the issue (e.g., a loose clip).

What to do in this situation?

Given that the car is being sold by a dealer, you have more recourse. It's perfectly reasonable to ask the dealer for clarification on this specific MOT advisory. You could ask:

• Why was 'Engine and under covers fitted' listed as a minor fault on the most recent MOT?
• Were the under-trays loose or damaged, or is this simply a note about their presence?
• Can they provide evidence of the previous advisories/failures for oil leaks and exhaust mounting, and explain how these have been rectified?

A reputable dealer should be transparent about the vehicle's history and any work that has been carried out. If they are evasive or unwilling to provide satisfactory answers, it might be a red flag.

Past Advisories vs. Current Failures

It's important to differentiate between past advisories and current failures. The MOT history you've checked will show any advisories or failures from previous tests. If the previous MOTs listed 'minor oil leaks' and 'front exhaust mounting' as advisories, it means the car passed those tests, but these were areas identified for potential future attention.

On the most recent MOT, if these specific items (oil leaks, exhaust mounting) were not mentioned as advisories or faults, it suggests that either the issues were resolved, or they were not deemed significant enough by the tester to warrant a mention. The new 'minor' fault you've noted needs to be understood in context.

Table: MOT Fault Categories Explained

Here's a quick summary of the different MOT fault categories:

Common Misconceptions

One common misconception is that a 'minor' fault means the car is perfectly fine. While it passes, it's still a fault that has been noted. Ignoring minor advisories can lead to more significant problems and potentially costly repairs later on. For example, a small oil leak, if left unattended, could worsen, potentially leading to engine damage or becoming a fire hazard. Similarly, a slightly worn exhaust mounting could eventually break, leading to a noisy exhaust and a potential failure on a future MOT.

Conclusion: What Does This Mean for Your Potential Purchase?

The MOT history of a vehicle is a valuable tool, but it's not the complete picture. While the DS3 you're looking at passed its most recent MOT, the specific 'minor' fault regarding the under-trays warrants further investigation. Your suspicion that they might be used to hide issues is plausible. Engage with the dealer, ask direct questions, and if possible, consider getting an independent pre-purchase inspection. This will give you a more comprehensive understanding of the vehicle's condition beyond the MOT certificate.

Frequently Asked Questions (FAQs)

Q1: Can a car fail its MOT for having under-trays fitted?

A1: A car will not automatically fail for having under-trays fitted. However, it can fail if the under-trays are loose, damaged, or if they prevent the MOT tester from properly inspecting essential components. In the latter case, the tester might record the presence of the under-trays as a minor issue if they cannot ascertain the condition of covered parts.

Q2: If a car has advisories on its MOT, does that mean it's unsafe?

A2: Not necessarily. Advisories are for defects that do not significantly affect safety or the environment at the time of the test. They are recommendations for future maintenance. However, it's wise to understand what these advisories are and plan for their repair.

Q3: Should I be worried about a 'minor oil leak' advisory?

A3: A minor oil leak advisory means there's a small amount of oil present, but it's not dripping heavily enough to fail the test. It's advisable to monitor the leak, check the oil level regularly, and consider getting it repaired to prevent it from worsening.

Q4: What should I do if a dealer is vague about MOT advisories?

A4: If a dealer is vague or unwilling to provide clear answers about MOT advisories or repairs, it's a cause for concern. It might be best to walk away or insist on a thorough independent inspection before committing to a purchase.

Q5: Are MOT testers allowed to remove engine covers?

A5: Generally, testers are not required to remove engine covers or under-trays if they are securely fitted. Their primary duty is to inspect the accessible parts of the vehicle. If a critical component is hidden and cannot be inspected, the vehicle may fail.