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

The Lexus IS is generally a reliable vehicle, but like any car, it can encounter issues that lead to MOT failures. Common problems include worn brake components, suspension issues, and emissions failures. Addressing these issues promptly can help ensure your Lexus IS passes its MOT with minimal hassle.
Brake System Failures
One of the most frequent reasons for MOT failures in the Lexus IS is related to the braking system. This can include worn brake pads, damaged discs, or issues with the brake lines. The DVSA MOT data indicates that brake-related failures are among the top concerns for vehicles in this category.
Replacing brake pads typically costs between £100 to £200, depending on whether you opt for standard or premium parts. Brake disc replacement can range from £150 to £300, while brake line repairs might set you back around £80 to £150. Regular maintenance and timely replacements can help avoid more serious issues down the line.
Suspension Problems
Suspension issues are another common reason for MOT failures in the Lexus IS. Components such as shock absorbers, springs, and bushings can wear out over time, leading to a rough ride and handling problems. The Honest John reliability index highlights suspension as a key area of concern for this model.
Replacing shock absorbers can cost approximately £150 to £300 for a pair, while coil spring replacements may range from £100 to £200. Bushings are generally less expensive, costing around £50 to £100 for parts and labour. Keeping an eye on suspension components can help maintain ride quality and safety.
Emissions Failures
Emissions failures are increasingly common in modern vehicles, including the Lexus IS. Issues with the exhaust system, catalytic converter, or engine management can lead to a vehicle failing its emissions test. The DVSA MOT data shows that emissions-related failures are on the rise as stricter regulations are enforced.
Repairing or replacing a catalytic converter can be quite costly, typically ranging from £500 to £1,200. Exhaust system repairs can vary widely, with minor fixes costing around £100, while complete system replacements may reach £600. Regular servicing and using quality fuel can help mitigate emissions issues.
Tyre Condition and Tread Depth
Tyres are crucial for safety and performance, and they are a common reason for MOT failures in the Lexus IS. Insufficient tread depth or damage to the tyre sidewalls can lead to a failed test. The legal minimum tread depth in the UK is 1.6mm, but many experts recommend replacing tyres when tread reaches 3mm for optimal safety.
Replacing a single tyre can cost between £50 to £150, depending on the brand and specifications. If multiple tyres need replacement, the costs can add up quickly. Regularly checking tyre condition and pressure can help prolong their lifespan and ensure safety.
Lighting and Visibility Issues
Lighting and visibility problems are another frequent cause of MOT failures for the Lexus IS. This can include faulty headlights, brake lights, or indicators, as well as issues with windscreen wipers or washers. Ensuring that all lights are functioning correctly is essential for both safety and passing the MOT.
Replacing a bulb typically costs around £10 to £30, while more complex lighting issues may require professional diagnosis and repair, potentially costing £50 to £150. Wiper blade replacements are generally inexpensive, ranging from £10 to £30. Regular checks can help prevent last-minute repairs before the MOT.
Steering and Alignment Problems
Steering and alignment issues can also lead to MOT failures in the Lexus IS. Problems with the steering rack, tie rods, or alignment can affect handling and safety. The Honest John reliability index notes that steering components can wear out over time, leading to potential failures.
Repairing or replacing a steering rack can be expensive, typically costing between £300 to £600. Tie rod replacements may range from £100 to £200, while alignment services generally cost around £50 to £100. Regular inspections can help identify steering issues early, ensuring a safer driving experience.
By staying proactive with maintenance and addressing common issues, Lexus IS owners can improve their chances of passing the MOT and enjoying a reliable driving experience.
Frequently asked questions
What is the Lexus IS MOT requirement?
In the UK, the Lexus IS must undergo an MOT test every year once it is three years old. This test checks that the vehicle meets road safety and environmental standards.
How can I check if my Lexus IS is due for an MOT?
You can check if your Lexus IS is due for an MOT by visiting the official government website. You will need to enter your vehicle registration number to find the MOT expiry date.
What should I do if my Lexus IS fails its MOT?
If your Lexus IS fails its MOT, you will receive a list of issues that need to be fixed. You must address these problems and have the vehicle retested before you can legally drive it.
How much does an MOT for a Lexus IS typically cost?
The cost of an MOT for a Lexus IS can vary depending on the garage, but it generally ranges from £30 to £50. It's a good idea to shop around for the best price.
Can I drive my Lexus IS if the MOT has expired?
No, you cannot legally drive your Lexus IS 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 documents do I need for my Lexus IS MOT?
You should bring your vehicle registration document and any previous MOT certificates to the appointment. It's also helpful to have your insurance details handy.
How long does an MOT test take for a Lexus IS?
An MOT test typically takes about 45 minutes to an hour. However, it may take longer if repairs are needed or if the garage is busy.
Are there any common issues with the Lexus IS that might affect its MOT?
Common issues that might affect the MOT of a Lexus IS include worn brake pads, faulty lights, and emissions problems. Regular maintenance can help prevent these issues.
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Sources
DVSA MOT History, Honest John reliability index, Parkers owner reviews, WhatCar reliability survey, UK Government MOT failure data.