BMW i3 MOT failure rates: what to expect
What fails on a BMW i3 at MOT, how often, and what each fix typically costs.

The BMW i3 is known for its unique design and electric performance, but like any vehicle, it can encounter issues during its MOT. Common failures include problems with the brakes, suspension, and electrical systems. Understanding these issues and their typical repair costs can help owners maintain their vehicles effectively.
Brake System Failures
The brake system is crucial for safety, and issues here are among the most common MOT failures for the BMW i3. Problems can arise from worn brake pads, damaged discs, or fluid leaks.
Replacing worn brake pads typically costs between £100 and £200, while disc replacement can range from £200 to £400, depending on the parts used. Regular checks and maintenance can prevent these issues from escalating, ensuring the brakes remain in good working order.
Suspension Problems
Suspension issues can lead to an MOT failure, particularly if components like shock absorbers or springs are worn or damaged. The BMW i3’s suspension system is designed for comfort and handling, but wear and tear can affect performance.
Replacing shock absorbers can cost between £150 and £300 per pair, while spring replacement may range from £100 to £250. Regular inspections can help identify problems early, allowing for timely repairs and avoiding more costly fixes later.
Electrical System Malfunctions
The BMW i3 is heavily reliant on its electrical systems, and faults in components such as lights, batteries, or wiring can lead to MOT failures. Common issues include faulty headlights or indicators, which are essential for safe driving.
Repairing or replacing faulty lights typically costs around £50 to £150, depending on the specific component. Battery issues can be more expensive, with replacement costs ranging from £300 to £600. Keeping an eye on electrical components and addressing issues promptly can help ensure a successful MOT.
Tyre Condition and Tread Depth
Tyres are vital for safety and performance, and their condition is a common area of concern during the MOT. The BMW i3 requires tyres that meet legal tread depth requirements and are free from damage.
Replacing tyres can be a significant expense, with costs ranging from £80 to £150 per tyre, depending on the brand and specifications. Regularly checking tyre pressure and tread depth can help avoid MOT failures and improve overall safety.
Bodywork and Structural Integrity
Bodywork issues, such as rust or damage to structural components, can also lead to MOT failures. The BMW i3’s unique design may make it more susceptible to certain types of damage, particularly if it has been involved in an accident.
Repairing bodywork can vary widely in cost, from £100 for minor dents to over £1,000 for significant structural repairs. Regular inspections can help identify rust or damage early, allowing for more affordable repairs and maintaining the vehicle’s integrity.
Emissions and Environmental Standards
As an electric vehicle, the BMW i3 has different emissions standards compared to traditional petrol or diesel cars. However, issues with the electric motor or battery can still affect its performance and compliance during the MOT.
While the i3 typically has lower emissions, battery replacement can be a costly affair, often ranging from £3,000 to £5,000. Regular maintenance of the electric system can help ensure compliance and avoid costly repairs down the line.
Understanding these common MOT failures and their associated costs can help BMW i3 owners prepare for their annual tests. Regular maintenance and prompt repairs can significantly reduce the likelihood of failures, ensuring the vehicle remains safe and roadworthy.
Frequently asked questions
What is the BMW i3 mot requirements?
The BMW i3 must undergo an MOT test once it is three years old. This annual test checks the vehicle's safety, roadworthiness, and emissions.
How can I check the MOT status of a BMW i3?
You can check the MOT status of a BMW i3 by visiting the official UK government website. You will need the vehicle's registration number to access the information.
What common issues might affect the BMW i3 during its MOT?
Common issues that may arise during an MOT for the BMW i3 include battery performance, tyre condition, and brake efficiency. Regular maintenance can help prevent these problems.
How much does an MOT for a BMW i3 typically cost?
The cost of an MOT for a BMW i3 can vary depending on the garage, but it generally ranges from £30 to £50. It's advisable to shop around for the best price.
What should I do if my BMW i3 fails its MOT?
If your BMW i3 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.
Can I drive my BMW i3 if the MOT has expired?
You cannot legally drive your BMW i3 if the MOT has expired, unless you are driving it to a pre-booked MOT appointment. It is important to renew the MOT on time.
Are there any exemptions for the BMW i3 regarding MOT?
Electric vehicles like the BMW i3 are not exempt from the MOT test. All vehicles over three years old must have a valid MOT certificate to be roadworthy.
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Sources
DVSA MOT History, Honest John reliability index, Parkers owner reviews, WhatCar reliability survey, UK Government MOT failure data.