MOT failure rates

BMW 4 Series MOT failure rates: what to expect

What fails on a BMW 4 Series at MOT, how often, and what each fix typically costs.

Updated 4th September 2026 DVSA data: Across 96,245 recorded MOT tests, 15.0% failed.

BMW 4 Series
Image via Wikipedia, CC-licensed.

The BMW 4 Series is a stylish and popular choice among drivers, but like any vehicle, it can encounter issues that may lead to MOT failures. Common problems include issues with brakes, lights, suspension, and emissions. Understanding these potential pitfalls can help you prepare for your MOT and budget for necessary repairs.

Brake System Failures

The brake system is one of the most critical components of any vehicle, and the BMW 4 Series is no exception. Common issues include worn brake pads, damaged discs, and brake fluid leaks. These problems can lead to a failed MOT, as brakes must meet strict safety standards.

Regular maintenance and checks can help prevent these issues from arising.

Lighting and Signalling Issues

Another frequent cause of MOT failures for the BMW 4 Series is lighting and signalling problems. This includes malfunctioning headlights, brake lights, and indicators. The DVSA MOT data indicates that lighting issues are among the top reasons for MOT failures across various models.

Regularly checking your lights can help ensure they are functioning correctly before your MOT.

Suspension Problems

The suspension system is vital for maintaining vehicle stability and comfort. Common issues with the BMW 4 Series include worn shock absorbers and damaged springs. These problems can lead to poor handling and a failed MOT, as the vehicle must pass strict safety checks.

Regular inspections can help identify suspension issues early, allowing for timely repairs and avoiding MOT failures.

Emissions Failures

Emissions testing is a crucial part of the MOT process, and the BMW 4 Series can face issues related to its exhaust system and catalytic converter. Problems such as a faulty oxygen sensor or a blocked catalytic converter can lead to increased emissions, resulting in a failed MOT.

Keeping up with regular servicing can help maintain the emissions system and avoid costly repairs.

Tyre Condition and Tread Depth

Tyres are essential for safety and performance, and the BMW 4 Series is no different. MOT failures often occur due to insufficient tread depth or damaged tyres. The legal minimum tread depth in the UK is 1.6mm, and anything below this can result in a failed MOT.

Regularly checking your tyre condition and tread depth can help you avoid MOT failures and ensure a safe driving experience.

Windscreen and Wiper Issues

A clear windscreen is vital for safe driving, and issues with the windscreen or wipers can lead to MOT failures. Common problems include cracks in the glass or worn wiper blades.

Regular checks can help ensure your visibility is not compromised.

By being aware of these common MOT failures and their associated costs, BMW 4 Series owners can take proactive steps to maintain their vehicles and ensure they pass their MOTs without unnecessary expenses. Regular servicing and inspections can help identify potential issues before they become costly repairs.

BMW 4 Series recall record

18 recalls have been issued for the BMW 4 Series, between 2017 and 2026.

  1. Replace the Engine Starter Motor

    R/2026/054

    Issued 2 March 2026

    The Safety Recall relates to the engine starter motor. The fault relates to the RSW22 starter RWT (reinforced water tightness). It was found that with RWT starters an increased abrasion of the magnetic contact can cause the growth of deposits at the lowest point of the relay interior. This in turn may increase the relay contact resistance resulting in false starts or even causing short circuits and possibly a thermal reaction. In case of a short circuit the possibility of a thermal event cannot be excluded. This may happen while attempting to start the vehicle or while driving due to vibrations causing a short circuit due to moving deposits.

    Remedy:On the affected vehicles the starter motor will be replaced with a variant by another supplier with a different design. Until the repair has been completed it is recommended to not leave the vehicle running unattended after starting the engine.

    Affects cars built Aug 2020 to Nov 2022

  2. Takata Driver and/or Passenger Airbag Recall (Global VINs)

    R/2025/349

    Issued 18 December 2025

    Affected vehicles are already included in Safety Recalls within the markets they have previously resided in. The vehicles may be fitted with a driver and/or passenger airbag/s which if deployed may do so with excessive force causing sharp metal fragments to be released this may cause serious injury which could prove fatal to people in the vicinity.

    Remedy:Vehicles will have the affected airbags checked and if necessary replaced.

    Affects cars built Mar 2014 to Oct 2017

  3. Replace the Engine Starter Motor

    R/2025/405

    Issued 27 October 2025

    For affected vehicles there is a concern involving water ingress and corrosion to the starter motor for where a short circuit cannot be ruled out. It is strongly recommended to park the vehicle outdoors and not in the immediate vicinity of buildings until the repair has been carried out.

    Remedy:Replacement of the starter motor.

    Affects cars built Dec 2019 to Jul 2020

  4. Screw Connection of the Power Supply

    R/2025/407

    Issued 6 October 2025

    On affected vehicles the screw connection on the B+ power distributor in the vehicle's boot may have not been properly tightened.

    Remedy:On affected vehicles the connections will be reworked.

    Affects cars built Jul 2025 to Jul 2025

14 older recalls not shown.

A recall applies to a build range, not to every car of this model. Check a registration to see whether one specific vehicle has an outstanding recall.

BMW 4 Series MOT record

From 96,245 recorded MOT tests, 15.0% failed.

MOT pass and failure rates by year of first registration
RegisteredTestsFailedMedian mileage
20214089.8%34,458 mi
20203,82011.8%38,032 mi
201910,07513.5%47,163 mi
201815,35613.0%55,686 mi
201716,97213.5%67,299 mi
201618,05014.5%77,676 mi
201517,82117.1%84,909 mi
201412,23019.3%89,477 mi

Most common reasons for failure

  1. Tyre tread depth not in accordance with the requirements39.0%
  2. A tyre seriously damaged23.9%
  3. a brake lining or pad worn below 1.5mm14.5%
  4. A tyre cords visible or damaged11.5%
  5. Brake disc or drum excessively weakened, insecure or fractured11.1%

Figures cover every BMW 4 Series tested in the DVSA dataset, not this specific car. Check a registration for the actual history of one vehicle.

BMW 4 Series official figures

Median across 21 variants on sale, petrol, petrol electric.

Combined economy
40.3 mpg
WLTP median across variants
CO2 emissions
159 g/km
Sets the first-year tax rate

Official figures for new cars. Real economy varies with driving, load and conditions.

Frequently asked questions

What is the BMW 4 Series MOT requirement?

In the UK, the BMW 4 Series requires an MOT test once it reaches three years old. This annual test checks the vehicle's safety, roadworthiness, and emissions.

How can I check the MOT status of a BMW 4 Series?

You can check the MOT status of a BMW 4 Series by visiting the official UK government website. You will need the vehicle's registration number to access the information.

What common issues might cause a BMW 4 Series to fail its MOT?

Common issues that may lead to an MOT failure for a BMW 4 Series include worn tyres, faulty lights, and issues with the brakes. Regular maintenance can help prevent these problems.

Can I drive my BMW 4 Series if the MOT has expired?

No, it is illegal to drive a BMW 4 Series on public roads if the MOT has expired, unless you are driving it to a pre-booked MOT appointment. You may face fines or penalties if caught.

What should I do if my BMW 4 Series fails its MOT?

If your BMW 4 Series fails its MOT, the garage will provide a list of issues that need to be addressed. You will need to fix these problems and have the vehicle retested.

How can I prepare my BMW 4 Series for its MOT?

To prepare your BMW 4 Series for its MOT, check the lights, tyres, and fluid levels. It is also a good idea to ensure that the windscreen wipers and brakes are in good condition.

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