2015 BMW 420 2.0L Diesel · YK15 AAO

The most recent MOT record from August 2025 shows a vehicle that passed but with persistent, unresolved brake-related issues. The tester flagged both front brake discs as worn, pitted, and corroded—an identical fault noted across all five tests since July 2023—alongside nearside front brake pads worn close to the wear sensor. The exhaust rattle, present in both the August 2025 tests, suggests a developing issue that has gone unaddressed for at least a year. While the August 2025 failure was primarily due to a serious fluid leak from the offside rear shock absorber, this was rectified before the subsequent pass, yet the recurring brake and exhaust concerns indicate a pattern of deferred maintenance rather than a sudden deterioration. The trend is neither stable nor improving; instead, it reflects a vehicle where critical components are being driven beyond their serviceable limits. The mileage accumulation of 127,799 miles over 11 years—roughly 11,618 miles annually—falls within typical expectations for a car of this age, though the clustering of tests around August each year suggests the vehicle may have been parked or lightly used for extended periods before being driven to test centres. The gap between the July 2023 failure and the August 2023 pass (just 28 miles apart) implies the car was likely kept in motion to meet the MOT deadline, rather than undergoing genuine use. The most recent 6,465-mile jump between August 2024 and August 2025 suggests the current owner has been driving it regularly, yet the unresolved faults indicate maintenance has not kept pace with mileage. A buyer should prioritise an in-person inspection of the front brake system, given the consistent corrosion, pitting, and pad wear across all records. The rear suspension must be thoroughly checked for fluid leaks, binding, or uneven wear, particularly on the offside, where the shock absorber failed in August 2025. The exhaust rattle demands immediate attention—likely originating from a loose or failing component, such as a heat shield or mounting bracket. Structural integrity should also be assessed, as the windscreen damage, while non-critical, has persisted since 2023, hinting at potential vibration or stress points that could affect long-term reliability. Tyre condition remains a secondary but important consideration, given the 2023 failure for near-limit tread depths and cuts.