14/05/2010
The annual MOT test can often feel like a daunting hurdle for vehicle owners across the UK. With modern cars increasingly incorporating advanced technology, a frequent query arises: 'Will my parking sensors cause my car to fail its MOT?' It's a completely valid concern, given how much we rely on these helpful aids for safe manoeuvring, particularly in tight urban spaces. However, let's clear up this common misconception right from the start: parking sensors are not currently part of the official MOT test inspection criteria.
This means that whether your parking sensor system is fully functional, intermittently faulty – like the 2004 Mercedes-Benz C230 described, which briefly activates before beeping and indicating a fault – or completely inoperative, it will not, in itself, lead to an MOT failure. The MOT test's primary focus is on ensuring your vehicle meets fundamental road safety and environmental standards. While parking sensors contribute to driving convenience and can help prevent minor bumps, they are not deemed critical safety components in the same vein as your brakes, lights, or steering.
Understanding the MOT: What's Really Checked?
An MOT test is an essential annual health check for your vehicle, designed to confirm it's safe to drive on public roads and meets environmental standards. It's a thorough inspection, not merely a quick glance. Nearly half of all faults found during an MOT could have been avoided by carrying out simple maintenance checks beforehand. Spending a little time on these pre-checks could save you both money and the hassle of a retest.
Key Areas of Inspection During Your MOT:
Let's delve into the crucial elements that an approved MOT tester will meticulously examine on your vehicle:
- Lights and Signalling: This is a major area for MOT failures, accounting for approximately 30% of all faults. All your vehicle's lights – front, rear, brake, fog, indicator, and even your registration plate lights and rear reflectors – must be correctly positioned, securely fitted, and not obscured. They must be in good condition, show the correct colour (white for headlights, with a permissible bluish tinge), and illuminate with a single operation of the switch. Pairs of lights must emit light of the same colour, size, and shape. Crucially, headlight aim (both dip beam and main beam) must be below the horizontal to prevent dazzling other drivers. Any electrical socket for a trailer must also be in good condition and correctly operate the trailer's parking lights, brake lights, indicators, and rear fog lights.
- Horn: Your vehicle's horn must emit a continuous, uniform note that is loud enough to be heard by other road users. A quick blast is all it takes to check this.
- Battery and Electrical Wiring: The battery must be securely mounted and show no signs of leaking electrolytes. Furthermore, all electrical wiring should be secure and free from damage that could lead to a short-circuit or detachment.
- Steering System: The steering wheel itself must be secure and in good condition. The technician will check for excessive play by pushing the wheel in various directions and inspecting all steering components for wear or damage. If your vehicle has a steering locking device, it should only engage when the engine is not running. For vehicles equipped with power steering, the fluid reservoir must contain at least the minimum required level of power steering fluid.
- Suspension: Suspension components and shock absorbers are rigorously checked for excessive corrosion, distortion, and fractures. A healthy suspension system is vital for vehicle control and ride comfort.
- Braking System: Brakes are fundamental to vehicle safety, and issues here account for about 9.6% of MOT failures. All components – including brake pedals and levers – must be in good condition, and any relevant warning lights must function correctly. A brake performance test will be carried out to assess braking efficiency. If your car pulls to one side when braking, this is a serious safety concern and indicates a problem that needs immediate attention.
- Tyres and Road Wheels: Tyres are another significant failure point, contributing to approximately 10% of all MOT faults. Your tyres must have an appropriate speed and load rating for your vehicle, and the tread depth must be at least 1.6mm across the central three-quarters of the tread around the entire circumference. The technician will also inspect for cuts exceeding 25mm, lumps, bulges, tears, exposed cords, and tread separation. For vehicles with run-flat tyres, the warning light must operate correctly. Road wheels themselves must be in good general condition, and all wheel nuts should be present and securely tightened.
- Seat Belts: All seat belts, including their attachment points and adjustment fittings, must be the correct length and in full working order. A sharp tug can help confirm the restraint system functions correctly, and you should check that all locks operate smoothly.
- Vehicle Body and Structure: A general inspection of the body, chassis, engine mountings, seats, bonnet, boot, and doors will be carried out. All components must be free from excessive corrosion and sharp edges that could cause injury.
- Registration Plates and Vehicle Identification Number (VIN): Registration plates must be secure and clearly legible from 20 metres away. They must be fitted to both the front and rear of the vehicle, with all characters correctly formed and spaced to prevent misreading. Every vehicle must also permanently display a legible VIN, either on a VIN plate, or stamped/etched on the body or chassis.
- Speedometer: A speedometer must be fitted and capable of being illuminated. While a cracked dial glass isn't a failure, the speed must be clearly readable.
- Exhaust System and Emissions: Your exhaust system must be secure and free of leaks. If your vehicle was originally fitted with a catalytic converter, it must still be present. Emissions of carbon monoxide and hydrocarbons must fall within legal limits, checked using a gas analyser probe. Visual checks for excessive smoke of any colour from the exhaust are also performed. Ensure you have sufficient engine oil and fuel levels for these checks.
- Mirrors and Driver's View of the Road: Rearview mirrors and wing mirrors must be secure and provide adequate views to the rear and side of the vehicle. Issues with the driver's view account for about 6.6% of MOT failures. The windscreen must not have damage or obstructions larger than 10mm in the area directly in front of the driver, or larger than 40mm outside this area but within the swept area.
- Windscreen Wipers and Washers: Wipers and washers must sweep a wide enough area to give the driver an adequate view of the road. Ensure your wiper blades are in good condition without signs of damage, and that screen wash levels are topped up.
As you can see, the MOT is an extensive examination. While your parking sensors are not on this list, many other crucial components are.
Common MOT Failure Points & How to Avoid Them
Understanding where most vehicles fall short can help you focus your pre-MOT checks:
| Area of Inspection | Common Failure Rate (Approx.) | Simple Pre-Check Tip |
|---|---|---|
| Lights and Signalling | 30% | Have a friend check all lights while you operate them from inside. |
| Tyres | 10% | Check tread depth (use a 20p coin) and tyre condition for cuts/bulges. |
| Brakes | 9.6% | Listen for grinding noises; note if the car pulls to one side when braking. |
| Driver's View of the Road (Mirrors, Windscreen, Wipers) | 6.6% | Check for chips/cracks, and ensure wipers clear the screen effectively. |
Practical Pre-MOT Checks You Can Do:
Taking a proactive approach can significantly increase your chances of a first-time pass:
- Lights: Turn on each light (headlights, high beams, indicators, brake lights, fog lights, reverse lights, number plate lights) and walk around your car to ensure they all work. Don't forget to check the hazard lights.
- Horn: Give it a quick honk. Is it loud and consistent?
- Tyres: Check the tread depth using a 20p coin (the outer band of the coin should be obscured). Look for any bulges, cracks, or embedded objects. Ensure tyre pressures are correct.
- Wipers and Washers: Operate your wipers to ensure they clear the windscreen effectively without streaking. Top up your screen wash and confirm the jets spray onto the screen.
- Brakes: Listen for any unusual noises (grinding, squealing) when braking. Note if your car pulls to one side. Check your brake fluid level.
- Fluid Levels: Ensure your engine oil, coolant, power steering fluid, and brake fluid are all at appropriate levels.
- Seat Belts: Pull each seat belt sharply to check the restraint mechanism. Ensure they retract smoothly and that the buckles click securely.
- Mirrors: Check that all mirrors (rearview and wing mirrors) are securely attached and that the glass is not cracked or broken in a way that obstructs your view.
- Windscreen: Inspect your windscreen for any chips or cracks, particularly in the area directly in front of the driver.
- Registration Plates: Ensure both front and rear plates are clean, legible, and securely attached.
- Exhaust: Listen for any unusual rattles or loud noises from the exhaust system. There should be no excessive smoke of any colour.
Frequently Asked Questions (FAQs)
Here are some common questions vehicle owners have regarding the MOT and specific components like parking sensors:
Q: Are parking sensors included in an MOT test?
A: No, parking sensors are not currently a mandatory item checked during the MOT test. Their functionality will not impact your vehicle's pass or fail status.
Q: My parking sensor system is faulty, like Colin Cooper's Mercedes. Will this be an MOT fail?
A: As established, no. An inoperative parking sensor system, even one that beeps and indicates a fault, will not cause your vehicle to fail its MOT. While it's advisable to get such issues rectified for convenience and to prevent minor accidents, it's not an MOT concern.
Q: What are the most common reasons for an MOT failure in the UK?
A: Historically, the most common reasons for MOT failures relate to lighting and signalling (around 30%), tyres (around 10%), brakes (around 9.6%), and issues affecting the driver's view of the road (around 6.6%), such as windscreen damage or faulty wipers.
Q: Can I drive my car if it fails its MOT?
A: Generally, no. If your vehicle fails its MOT, it is illegal to drive it on public roads until the necessary repairs have been made and it has passed a retest. The only exceptions are driving to a pre-arranged appointment for repairs or to a retest centre.
Q: How long is an MOT certificate valid for?
A: An MOT certificate is valid for 12 months from the date it was issued. You can have your MOT done up to a month (minus a day) before your current certificate expires and still keep the same renewal date.
Q: Should I bother getting my parking sensors fixed if they don't affect the MOT?
A: While not an MOT requirement, functional parking sensors offer valuable peace of mind and can significantly aid in preventing minor collisions and scuffs when parking. It's generally a good idea to get any faulty systems checked and repaired for optimal vehicle functionality and convenience.
Conclusion
The annual MOT test is a vital process to ensure your vehicle remains safe and roadworthy. While it's easy to get caught up in worries about every piece of technology, remember that the MOT's focus is on fundamental vehicle standards. Rest assured that your parking sensors, whether working perfectly or experiencing a glitch, will not be the reason your car fails its MOT. Instead, channel your efforts into the critical areas of lights, tyres, brakes, and your overall view of the road. A little proactive maintenance and understanding of the MOT criteria can save you stress, time, and money, ensuring your vehicle is ready for the road ahead.
If you want to read more articles similar to Parking Sensors & Your MOT: The Definitive Guide, you can visit the MOT category.