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

The Mitsubishi ASX often faces MOT failures primarily due to issues with its lighting, suspension, and emissions systems. Common problems include faulty bulbs, worn suspension components, and exhaust system leaks. Addressing these issues can vary in cost, but many repairs are manageable for most budgets.
Lighting Issues
One of the most frequent causes of MOT failures for the Mitsubishi ASX is lighting problems. This includes issues such as blown bulbs, misaligned headlights, and malfunctioning indicators. During an MOT, all lights must be operational and correctly aligned to ensure visibility and safety.
Replacing a blown bulb typically costs around £10 to £20, depending on the type of bulb required. Headlight alignment adjustments may incur a charge of £20 to £30 at a garage. Regular checks of the vehicle’s lights can help prevent these issues from arising during the MOT.
Suspension Components
Suspension problems are another common reason for MOT failures in the ASX. Worn or damaged suspension components, such as shock absorbers and bushings, can lead to handling issues and increased tyre wear. MOT testers will check for excessive play or leaks in the suspension system.
Replacing worn shock absorbers can cost between £150 to £300 per pair, while bushings may range from £50 to £150 for parts and labour. Keeping the suspension system in good condition is essential not just for passing the MOT but also for ensuring a comfortable ride.
Emissions Failures
Emissions-related failures are increasingly common in modern vehicles, including the Mitsubishi ASX. The MOT test checks for excessive emissions from the exhaust system. Common culprits include faulty catalytic converters, oxygen sensors, and exhaust leaks.
Repairing or replacing a catalytic converter can be quite expensive, often costing between £300 to £1,000 depending on the vehicle and parts used. Oxygen sensor replacements typically cost around £100 to £200. Regular servicing can help maintain the emissions system and prevent costly repairs.
Brake System Issues
The brake system is critical for safety, and any faults can lead to an MOT failure. Common issues include worn brake pads, damaged discs, and leaks in the brake lines. The MOT test evaluates the effectiveness of the braking system, and any deficiencies must be addressed.
Replacing brake pads usually costs between £100 to £200, while disc replacements can add another £150 to £300. Regular brake checks and timely replacements can help ensure the vehicle remains safe and compliant with MOT standards.
Tyre Condition
Tyres are a vital component of vehicle safety and performance. The MOT test checks for tread depth, sidewall damage, and overall tyre condition. The legal minimum tread depth is 1.6mm, and any tyres below this limit will result in a failure.
Replacing tyres can vary significantly in cost, typically ranging from £50 to £150 per tyre, depending on the brand and size. Regularly inspecting tyre condition and maintaining proper pressure can help avoid MOT failures related to tyres.
Steering System Problems
Issues with the steering system can also lead to MOT failures for the Mitsubishi ASX. Common problems include worn steering racks, loose components, and misalignment. The steering system must be responsive and free from excessive play to pass the MOT.
Repairing or replacing a steering rack can be costly, often ranging from £300 to £600. Steering alignment services typically cost around £50 to £100. Regular maintenance and checks can help ensure the steering system remains in good condition, reducing the likelihood of MOT failures.
Frequently asked questions
What is the Mitsubishi ASX mot?
The Mitsubishi ASX mot refers to the Ministry of Transport test, which checks the vehicle's safety and environmental standards. It's a legal requirement for cars over three years old in the UK.
How often do I need to get my Mitsubishi ASX mot done?
You need to have your Mitsubishi ASX mot done every year once it reaches three years old. It's important to keep up with this to ensure your vehicle remains roadworthy.
What are common reasons for failing the Mitsubishi ASX mot?
Common reasons for failing the mot include issues with lights, brakes, tyres, and emissions. Regular maintenance can help prevent these problems.
Can I drive my Mitsubishi ASX if it fails the mot?
No, you cannot legally drive your Mitsubishi ASX if it fails the mot unless you are taking it to a garage for repairs. It's best to arrange for repairs as soon as possible.
How can I prepare my Mitsubishi ASX for the mot?
To prepare your Mitsubishi ASX for the mot, check the lights, brakes, and tyre condition. It’s also a good idea to ensure that the windscreen wipers and washers are functioning properly.
What should I do if my Mitsubishi ASX mot is due soon?
If your Mitsubishi ASX mot is due soon, book an appointment with an authorised testing centre. Make sure to check your vehicle's condition beforehand to avoid any last-minute issues.
Where can I find a reliable mot testing centre for my Mitsubishi ASX?
You can find a reliable mot testing centre by searching online for local garages that are authorised to conduct mot tests. Reading customer reviews can also help you choose a trustworthy option.
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Sources
DVSA MOT History, Honest John reliability index, Parkers owner reviews, WhatCar reliability survey, UK Government MOT failure data.