MG 5 MOT failure rates: what to expect
What fails on a MG 5 at MOT, how often, and what each fix typically costs.

The MG 5 often faces issues during its MOT, with the most common failures being related to lights, brakes, and suspension components. Typical repair costs can vary, but addressing these issues promptly can help ensure your vehicle passes its next MOT without complications.
Lights and Electrical Components
One of the most frequent reasons for MOT failure in the MG 5 is related to lights and electrical systems. This can include faulty headlights, brake lights, or indicators. A blown bulb is a simple fix, but wiring issues can be more complex.
Replacing a blown bulb usually costs between £10 to £20, depending on the type of bulb required. However, if the issue lies within the wiring or the light assembly itself, repairs can escalate to £50 or more. Regularly checking your lights can prevent these issues from arising during the MOT.
Braking System Failures
Brakes are crucial for safety, and any issues with the braking system can lead to an MOT failure. Common problems include worn brake pads, damaged discs, or issues with the brake lines. The MG 5 has been noted for brake wear, especially in urban driving conditions.
Replacing brake pads typically costs around £100 to £200, while disc replacements can range from £150 to £300. If the brake lines are corroded or damaged, repairs may cost an additional £50 to £150. Keeping an eye on brake performance and addressing wear early can help avoid costly repairs.
Suspension and Steering Issues
The suspension and steering systems are vital for vehicle stability and comfort. Common failures in the MG 5 include worn shock absorbers, broken springs, or issues with the steering rack. These problems can lead to a bumpy ride and affect handling.
Replacing shock absorbers can cost between £100 to £300, depending on whether you choose OEM or aftermarket parts. Spring replacements may range from £150 to £250. Steering issues can be more expensive, with repairs potentially costing upwards of £200. Regular maintenance and inspections can help catch these issues before an MOT.
Tyre Condition and Tread Depth
Tyres are essential for safety and performance, and they are a common MOT failure point. The MG 5 must have a minimum tread depth of 1.6mm across the central three-quarters of the tyre. Worn or damaged tyres can lead to an automatic fail.
Replacing tyres can vary significantly in cost, typically ranging from £50 to £150 per tyre, depending on the brand and type. Regularly checking tread depth and ensuring proper inflation can help maintain tyre condition and prevent MOT failures.
Exhaust Emissions and System Integrity
Exhaust emissions are closely monitored during the MOT, and any issues can lead to a failure. The MG 5’s emissions system, including the catalytic converter and exhaust pipes, must be in good condition. Common problems include leaks or a malfunctioning catalytic converter.
Repairing exhaust leaks may cost between £50 to £150, while a new catalytic converter can be significantly more expensive, often ranging from £300 to £800. Keeping the exhaust system well-maintained can help ensure compliance with emissions standards.
Windshield and Wiper Functionality
The condition of the windshield and wipers is another common MOT failure point. Issues such as cracks in the glass, inadequate wiper function, or damaged washer jets can lead to a failed test. The MG 5’s visibility features are essential for safe driving.
Repairing minor cracks may cost around £50, while a full windshield replacement can range from £200 to £400. Wiper blade replacements are relatively inexpensive, typically costing between £10 to £30. Regularly inspecting these components can help maintain visibility and ensure a pass during the MOT.
Frequently asked questions
What is the MG 5 mot?
The MG 5 mot refers to the Ministry of Transport test for the MG 5 vehicle. It checks the car's safety, roadworthiness, and emissions to ensure it meets UK regulations.
How often do I need to get my MG 5 mot?
In the UK, you must have an mot test every 12 months once your car is three years old. It's important to keep up with this requirement to ensure your vehicle remains legal to drive.
What are common reasons for MG 5 mot failures?
Common reasons for mot failures include issues with brakes, lights, tyres, and emissions. Regular maintenance can help prevent these problems.
Can I drive my MG 5 if the mot has expired?
No, you cannot legally drive your MG 5 if the mot has expired, unless you are driving it to a pre-booked mot appointment. Failing to have a valid mot can result in fines.
How can I prepare my MG 5 for its mot?
To prepare your MG 5 for its mot, check the lights, tyres, and fluid levels. It’s also a good idea to ensure that the windscreen wipers and brakes are in good condition.
Where can I get my MG 5 mot done?
You can get your MG 5 mot done at any authorised mot testing centre in the UK. Many garages offer this service, so you can choose one that is convenient for you.
What should I do if my MG 5 fails the mot?
If your MG 5 fails the mot, you will receive a list of issues that need to be addressed. You can have the necessary repairs done and then retest the vehicle.
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Sources
DVSA MOT History, Honest John reliability index, Parkers owner reviews, WhatCar reliability survey, UK Government MOT failure data.