If your annual MOT test is approaching, you may be wondering exactly what they check in an MOT and whether your vehicle is likely to pass. Every year, millions of vehicles across the UK undergo MOT testing to ensure they meet the minimum legal standards for road safety and environmental performance. While many drivers understand that an MOT is a legal requirement, fewer know what the inspection actually involves.
Knowing what is checked during an MOT helps you prepare your vehicle in advance, avoid common reasons for failure, and reduce the likelihood of unexpected repair costs. Something as simple as replacing a faulty bulb or topping up your windscreen washer fluid before your appointment could make the difference between a pass and a fail.
Whether you’re booking your first MOT or simply want to understand the process better, this guide explains what they check in an MOT, why each inspection is important, and how you can improve your chances of passing the first time.
What Is an MOT Test?
An MOT test is an annual vehicle inspection required by UK law for most vehicles over three years old. The test is carried out according to standards set by the Driver and Vehicle Standards Agency (DVSA) and is designed to ensure that vehicles remain safe to drive and meet environmental regulations.
Unlike a routine vehicle service, an MOT does not assess the overall mechanical condition of your car. Instead, it focuses on specific safety, roadworthiness, and emissions-related components that are essential for safe driving.
The inspection is performed by a qualified MOT tester at a DVSA-approved testing station. If your vehicle meets the required standards, you’ll receive an MOT certificate confirming that it has passed. If defects are found, you’ll receive a report outlining the issues that need attention before the vehicle can legally remain on the road.
Many motorists choose to combine their MOT with a vehicle service, as routine maintenance can identify worn components before they lead to an MOT failure.
Looking for professional MOT testing? If your vehicle is due for its annual inspection, you can book a Car MOT in York with Gladstone Tyres & Autocare. Our experienced technicians carry out DVSA-approved MOT tests for all makes and models while providing honest advice and transparent service.
Why Is an MOT Test Important?
An MOT is much more than a legal obligation. It plays a vital role in keeping vehicles safe, reducing accidents caused by mechanical defects, and ensuring cars comply with environmental standards.
Driving with an unsafe vehicle puts you, your passengers, and other road users at risk. The annual MOT helps identify issues before they become serious safety hazards.
A valid MOT also offers several important benefits:
- Confirms your vehicle meets DVSA safety standards.
- Helps identify worn or damaged components before they fail completely.
- Supports safer driving throughout the year.
- Ensures emissions remain within legal limits.
- Helps maintain your vehicle’s resale value by demonstrating regular maintenance.
- Reduces the likelihood of expensive repairs by identifying faults early.
Although an MOT checks many important components, it should never replace routine maintenance. Regular servicing helps prevent many of the issues that commonly result in MOT failures.
What Do They Check in an MOT?
During the inspection, the MOT tester examines a wide range of safety and environmental components to determine whether the vehicle meets the minimum legal requirements.
The exact inspection follows DVSA guidelines and covers several key systems throughout the vehicle.
1. Vehicle Lights and Electrical Equipment
Lighting is one of the most common causes of MOT failures, yet it’s also one of the easiest issues to prevent.
During the inspection, the tester checks:
- Headlights
- Brake lights
- Rear lights
- Indicators
- Hazard warning lights
- Fog lights
- Reverse lights (where applicable)
- Number plate lights
The tester also checks that all lights are securely fitted, correctly aligned, the appropriate colour, and operating as intended.
A single faulty bulb may result in your vehicle failing the MOT, so it’s worth checking every light before your appointment.
2. Brakes and Braking System
Your vehicle’s braking system is one of the most critical safety components assessed during the MOT.
The tester inspects:
- Brake pads
- Brake discs
- Brake callipers
- Brake hoses
- Brake pipes
- Brake fluid leaks
- Parking brake (handbrake)
- Overall braking performance
Braking efficiency is measured using specialist equipment to ensure the system performs within legal safety standards.
Because worn brakes are one of the leading causes of MOT failures, drivers should never ignore squeaking, grinding noises, or reduced braking performance.
If you notice any braking issues before your MOT, having them inspected early can help avoid unnecessary delays or repair costs.
3. Tyres and Wheels
Tyres are another major area of the MOT inspection because they directly affect grip, handling, and stopping distances.
The MOT tester checks:
- Tread depth
- Uneven tyre wear
- Sidewall damage
- Cuts and bulges
- Correct tyre size
- Wheel condition
- Secure wheel fixings
In the UK, the legal minimum tread depth for cars is 1.6mm across the central three-quarters of the tyre. Any tyre below this limit will result in an MOT failure and should be replaced immediately.
Regular tyre inspections not only improve your chances of passing the MOT but also enhance fuel efficiency and road safety.
4. Steering and Suspension
The steering and suspension systems are essential for maintaining vehicle control, stability and passenger safety. Even minor wear in these components can affect how your car handles, especially during emergency manoeuvres or poor weather conditions.
During the MOT inspection, the tester checks:
- Steering wheel condition and movement
- Steering rack and steering column
- Ball joints
- Track rod ends
- Shock absorbers
- Coil springs
- Suspension arms
- Suspension bushes
Any excessive wear, damage or looseness may result in an MOT failure.
Many steering and suspension issues develop gradually, making them difficult for drivers to notice. If your vehicle pulls to one side, feels unstable over bumps or produces knocking noises while driving, it is advisable to have it inspected before your MOT appointment.
5. Windscreen, Wipers and Washers
Clear visibility is vital for safe driving, which is why your windscreen and visibility equipment form an important part of every MOT inspection.
The tester checks:
- Windscreen condition
- Windscreen cracks or chips
- Wiper blade condition
- Washer operation
- Driver visibility
Damage within the driver’s line of vision may result in an MOT failure if it exceeds the permitted size or obstructs visibility.
Worn wiper blades are another common issue. Fortunately, replacing them before your MOT is quick, inexpensive and can help prevent an unnecessary failure.
6. Mirrors
Although mirrors are often overlooked, they play an important role in helping drivers remain aware of surrounding traffic.
During the inspection, the MOT tester checks:
- Rear-view mirror
- Driver’s side mirror
- Passenger mirror (where fitted)
- Mirror security
- Visibility
- Mirror condition
Missing, loose or damaged mirrors that significantly affect visibility can lead to an MOT failure.
7. Seat Belts
Seat belts are one of the most important safety features in any vehicle.
Every fitted seat belt is inspected for:
- Correct operation
- Security
- Damage
- Locking mechanism
- Retracting function
The tester will also check that seat belt warning lights operate correctly where applicable.
Any seat belt that fails to function properly represents a significant safety risk and is likely to result in a failed MOT.
8. Vehicle Horn
The vehicle horn may seem like a simple component, but it is a legal safety requirement.
During the MOT, the tester ensures that:
- The horn works correctly.
- It produces a continuous warning sound.
- It is suitable for warning other road users.
A horn that is not working correctly can result in an MOT failure.
9. Registration Plates
Registration plates must comply with UK regulations.
The MOT inspection checks:
- Plate condition
- Correct lettering
- Proper spacing
- Secure fixing
- Visibility
- Legibility
Dirty, cracked or incorrectly spaced number plates may fail the inspection.
Before your MOT appointment, it is worth cleaning your registration plates and ensuring they are securely attached.
10. Exhaust System and Vehicle Emissions
One of the most important parts of the MOT inspection involves checking your vehicle’s exhaust and emissions system.
The MOT tester examines:
- Exhaust condition
- Exhaust leaks
- Exhaust mounting points
- Vehicle emissions
- Catalytic converter (where fitted)
- Diesel Particulate Filter (DPF) where applicable
Modern diesel vehicles are also assessed for excessive smoke emissions.
If your DPF is blocked or your emissions exceed the legal limit, your vehicle is likely to fail its MOT.
Regular servicing and professional diagnostics can often identify emissions-related issues before your annual inspection.
11. Vehicle Body and Structure
The overall condition of your vehicle is another important aspect of the MOT inspection.
The tester checks:
- Corrosion affecting structural areas
- Chassis condition
- Doors
- Bonnet
- Boot
- Door latches
- Structural security
Rust around critical structural components such as suspension mounting points or seat belt anchorages can result in a failed MOT.
Minor cosmetic scratches or dents generally do not affect the outcome of the inspection unless they compromise vehicle safety.
12. Fuel System
Fuel system safety is also assessed during an MOT.
The tester checks:
- Fuel lines
- Fuel tank security
- Fuel cap
- Fuel leaks
Any fuel leak is treated as a serious safety issue and may result in an immediate MOT failure.
What Is NOT Checked During an MOT?
Many drivers mistakenly believe that an MOT is the same as a full vehicle service. In reality, an MOT focuses on minimum legal safety standards and does not assess every mechanical component.
An MOT does not include:
- Engine oil condition
- Oil filter replacement
- Air filter replacement
- Spark plugs
- Timing belt condition
- Clutch wear
- Gearbox condition
- Engine performance
- Coolant replacement
These items are typically covered during a routine vehicle service rather than an MOT inspection.
For this reason, many motorists choose to combine their MOT with a scheduled service to help identify potential mechanical issues before they become costly repairs.
If you’re unsure whether your vehicle needs servicing before its MOT, our experienced technicians can provide expert advice and carry out any necessary maintenance before the inspection.
Common Reasons Cars Fail an MOT
Although many MOT failures involve relatively simple problems, they can still prevent your vehicle from passing the inspection.
Some of the most common reasons for MOT failure include:
- Worn brake pads or brake discs
- Tyres below the legal tread depth
- Faulty headlights or brake lights
- Damaged suspension components
- Steering defects
- Excessive exhaust emissions
- Windscreen damage
- Worn windscreen wiper blades
- Faulty seat belts
- Registration plate issues
Many of these faults can be identified during routine servicing, helping drivers avoid unnecessary inconvenience and repair costs.
How to Prepare for an MOT Test
Taking a few minutes to inspect your vehicle before the appointment can significantly improve your chances of passing first time.
Before your MOT, you should:
- Check all lights are working.
- Inspect your tyres for tread depth and damage.
- Top up washer fluid.
- Ensure windscreen wipers clear the screen effectively.
- Check your horn.
- Make sure seat belts fasten correctly.
- Clean your registration plates.
- Remove unnecessary items that could obstruct the inspection.
- Arrange repairs for any warning lights or unusual noises before the test.
These simple checks can prevent avoidable failures and help keep your vehicle roadworthy throughout the year.
What Happens If Your Car Fails Its MOT?
Failing an MOT doesn’t necessarily mean your vehicle requires expensive repairs. In many cases, the issues identified are relatively minor and can be resolved quickly. However, understanding the MOT defect categories can help you know what happens next.
After the inspection, your vehicle will be placed into one of four defect categories:
Dangerous Defects
Dangerous defects pose an immediate risk to road safety or the environment. If your vehicle receives a dangerous defect, it should not be driven until the necessary repairs have been completed.
Examples include:
- Severely worn brakes
- Unsafe tyres
- Significant steering defects
- Serious suspension damage
- Major fuel leaks
Driving a vehicle with dangerous defects could result in prosecution and may invalidate your insurance.
Major Defects
Major defects mean your vehicle has failed the MOT and repairs are required before it can legally pass.
Common major defects include:
- Faulty lights
- Worn tyres
- Damaged windscreen wipers
- Excessive emissions
- Brake imbalance
- Suspension wear
Once the repairs have been completed, your vehicle can be retested.
Minor Defects
Minor defects do not result in an MOT failure but indicate that a component is beginning to wear and should be repaired soon.
Addressing minor issues early can help prevent more expensive repairs and reduce the risk of future MOT failures.
Advisory Items
Advisory notes are not faults but highlight components that may require attention before the next MOT.
For example:
- Brake pads showing signs of wear
- Tyres approaching the legal tread limit
- Light corrosion
- Slight suspension wear
These advisories provide valuable information that can help you plan future maintenance.
Does an MOT Include a Vehicle Service?
One of the most common questions drivers ask is whether an MOT includes a vehicle service.
The answer is no.
Although both are important for maintaining your vehicle, they serve different purposes.
An MOT focuses on:
- Road safety
- Legal compliance
- Vehicle emissions
- Minimum operating standards
A vehicle service focuses on:
- Engine oil replacement
- Oil and air filter changes
- Fluid level checks
- Spark plug replacement (where applicable)
- Battery health
- Cooling system inspection
- Preventative maintenance
For the best results, many drivers choose to combine their annual MOT with a scheduled service. This helps identify worn components before they become MOT failures and contributes to the long-term reliability of the vehicle.
If your MOT is approaching, it’s worth considering a Car Service in York before your inspection to improve your chances of passing first time.
Internal Link: Car Servicing in York
How Long Does an MOT Take?
Most MOT tests take between 45 and 60 minutes, although the exact duration depends on the type and condition of the vehicle.
Additional time may be required if:
- Further inspection is needed
- Repairs are requested after a failed MOT
- The garage is carrying out servicing alongside the MOT
Booking your MOT in advance also gives you more flexibility if repairs are required before your certificate expires.
How to Improve Your Chances of Passing an MOT
Although no garage can guarantee a pass, there are several simple steps you can take before your appointment.
Check Your Lights
Ask someone to help you check your headlights, indicators, brake lights and number plate lights.
Inspect Your Tyres
Ensure your tyres meet the legal tread depth of at least 1.6mm and are free from cuts or bulges.
Top Up Fluids
Fill your windscreen washer bottle and ensure the washers operate correctly.
Replace Worn Wiper Blades
Damaged or ineffective wipers are a common reason for failure and are inexpensive to replace.
Listen for Unusual Noises
Knocking, grinding or squealing sounds may indicate issues with your brakes or suspension.
Deal With Dashboard Warning Lights
If your engine management light, ABS light or airbag warning light is illuminated, have the vehicle professionally diagnosed before your MOT.
Book Routine Servicing
Regular servicing identifies wear before it becomes an MOT failure, saving time and money in the long run.
Why Choose Gladstone Tyres & Autocare for Your MOT in York?
Choosing the right MOT centre is just as important as preparing your vehicle.
At Gladstone Tyres & Autocare, we provide professional Car MOT in York for all makes and models, carried out by experienced technicians using DVSA-approved testing procedures.
When you choose us, you benefit from:
- DVSA-approved MOT testing
- Experienced and qualified MOT testers
- Honest advice with no unnecessary repairs
- Transparent pricing
- Fast appointment availability
- MOT testing for petrol, diesel, hybrid and electric vehicles
- Vehicle servicing and repairs under one roof
- Friendly local customer service
Whether your vehicle passes first time or requires repairs, our team will clearly explain the results and help you get safely back on the road.
Frequently Asked Questions
What do they check in an MOT?
An MOT includes inspections of the brakes, tyres, steering, suspension, lights, emissions, exhaust system, mirrors, seat belts, registration plates, windscreen, wipers and other essential safety components.
What is checked during an MOT that causes most failures?
The most common reasons for MOT failures include worn tyres, faulty lights, brake defects, suspension wear, excessive emissions and windscreen damage.
Can I drive my car if it fails its MOT?
If your vehicle has a dangerous defect, you should not drive it until it has been repaired.
If it has a major defect, you may only be able to drive it in limited circumstances, such as to a pre-arranged repair appointment, provided it remains roadworthy. Always follow the advice given after the test.
Do electric cars need an MOT?
Yes. Electric vehicles require an MOT once they are more than three years old. Although they are not subject to exhaust emissions testing, many other safety checks still apply.
Does an MOT check the engine?
An MOT does not assess the engine’s overall condition. However, issues such as excessive exhaust emissions or dashboard warning lights may affect the outcome of the inspection.
Can a cracked windscreen fail an MOT?
Yes. A crack or chip that significantly affects the driver’s view or exceeds legal limits can result in an MOT failure.
How often should I have an MOT?
Most cars require an MOT every year after they are three years old. Booking your test before the current certificate expires helps ensure you remain legally compliant.
Final Thoughts
Understanding what they check in an MOT allows you to prepare your vehicle, reduce the risk of unexpected failures and keep your car safe and roadworthy throughout the year.
Many common MOT failures can be avoided with regular servicing and simple pre-test checks. By maintaining your vehicle properly and addressing minor issues early, you can improve your chances of passing the inspection first time while reducing long-term repair costs.
If your MOT is due soon and you’re looking for a trusted local garage, Gladstone Tyres & Autocare provides professional Car MOT in York carried out by experienced technicians using DVSA-approved testing procedures.
Whether you need an MOT, vehicle servicing, brake repairs or diagnostics, our team is here to help keep your vehicle performing at its best.
Book Your Car MOT in York Today
If your MOT expiry date is approaching, don’t leave it until the last minute.
Book your Car MOT in York with Gladstone Tyres & Autocare and benefit from professional testing, honest advice and reliable service from a trusted local garage.
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