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

The Subaru Outback is generally a reliable vehicle, but like any car, it can encounter issues that may lead to an MOT failure. Common problems include suspension wear, emissions failures, and brake system issues. Fixing these problems can vary in cost, but being aware of them can help you prepare for your next MOT.
Suspension Problems
One of the most frequent causes of MOT failure for the Subaru Outback is suspension wear. Components such as shock absorbers, struts, and bushings can degrade over time, leading to a bumpy ride and compromised handling.
Replacing worn shock absorbers can cost between £150 and £300 per pair, depending on whether you choose OEM or aftermarket parts. If the suspension bushes are worn, replacement can range from £100 to £200, depending on the complexity of the job. Regular checks can help identify these issues before they lead to an MOT failure.
Emissions Failures
Emissions-related failures are also common in the Subaru Outback. The vehicle’s exhaust system, including the catalytic converter and oxygen sensors, can fail to meet UK emissions standards.
A faulty catalytic converter can be quite costly to replace, typically ranging from £500 to £1,200. Oxygen sensors, on the other hand, are less expensive, usually costing between £100 and £200 for parts and labour. Keeping an eye on warning lights and having regular emissions checks can help prevent these failures.
Brake System Issues
The brake system is crucial for safety, and any issues here can lead to an MOT failure. Common problems include worn brake pads, damaged discs, or leaks in the brake lines.
Replacing brake pads can cost between £100 and £200, while brake discs may range from £150 to £300 for a full set. If there are leaks in the brake lines, repairs can vary widely, but you might expect to pay between £100 and £300 depending on the extent of the damage. Regular maintenance of the brake system is essential to ensure safety and pass the MOT.
Tyre Condition
Tyres are another common area where the Subaru Outback can fail its MOT. Issues such as tread depth below the legal limit or uneven wear can lead to a failure.
In the UK, the minimum tread depth is 1.6mm across the central three-quarters of the tyre. If your tyres are worn, replacing them can cost between £50 and £150 each, depending on the brand and size. Regularly checking tyre pressure and tread depth can help you avoid unexpected failures.
Lighting and Electrical Systems
Lighting and electrical issues can also cause MOT failures in the Subaru Outback. Problems may include faulty bulbs, damaged wiring, or issues with the battery and alternator.
Replacing a blown bulb is relatively inexpensive, typically costing around £10 to £20. However, if there are more significant electrical issues, such as a failing alternator, repairs can range from £200 to £500. Regular checks of all lights and electrical components can help catch these issues early.
Bodywork and Structural Integrity
Finally, the condition of the bodywork and structural integrity of the Subaru Outback can lead to MOT failures. Rust, corrosion, or damage to the chassis can be problematic.
Repairing rust can be a simple patch job costing around £100, but extensive corrosion may require more significant repairs, potentially costing £500 or more. Keeping the vehicle clean and regularly inspecting for signs of rust can help maintain its structural integrity and pass the MOT.
By staying informed about these common issues and their associated costs, you can better prepare your Subaru Outback for its next MOT and avoid unexpected expenses. Regular maintenance and timely repairs can ensure your vehicle remains reliable and roadworthy.
Frequently asked questions
What is the MOT requirement for a Subaru Outback?
In the UK, a Subaru Outback must have an MOT test when it is three years old and then annually thereafter. This ensures that the vehicle meets safety and environmental standards.
How can I check the MOT history of a Subaru Outback?
You can check the MOT history of a Subaru Outback by visiting the official UK government website. You will need the vehicle's registration number to access its MOT records.
What common issues might cause a Subaru Outback to fail its MOT?
Common issues that could lead to an MOT failure for a Subaru Outback include worn brakes, faulty lights, and issues with emissions. Regular maintenance can help prevent these problems.
How much does an MOT for a Subaru Outback typically cost?
The cost of an MOT for a Subaru Outback can vary depending on the garage, but it generally ranges from £30 to £50. It's advisable to shop around for the best price.
Can I drive my Subaru Outback if the MOT has expired?
No, you cannot legally drive your Subaru Outback if the MOT has expired, unless you are driving it to a pre-booked MOT appointment. Doing so can result in fines and penalties.
What should I do if my Subaru Outback fails its MOT?
If your Subaru Outback fails its MOT, you will receive a list of issues that need to be addressed. You must fix these problems and have the vehicle retested before you can legally drive it.
How can I prepare my Subaru Outback for its MOT?
To prepare your Subaru Outback for its MOT, ensure that all lights are working, check tyre condition and pressure, and top up fluids. A pre-MOT inspection can also help identify potential issues.
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Sources
DVSA MOT History, Honest John reliability index, Parkers owner reviews, WhatCar reliability survey, UK Government MOT failure data.