2016 BMW M4 3.0L Petrol · LS66 VTC

The latest MOT test for the 2016 BMW M4 recorded a clean pass on 2026-06-22, marking a positive turnaround from its previous failure on 2026-06-08, where a major defect was identified in the exhaust emissions system with Lambda readings outside specified limits. This indicates a return to compliance, though the prior failure suggests a recurring issue with the catalytic converter or oxygen sensor circuit that warrants further attention. The overall maintenance trend over the past three years has been predominantly stable, with only minor advisories noted in previous tests, particularly related to tyre wear patterns rather than structural or safety-critical components. The absence of repeated failures beyond the emissions issue reflects a generally well-maintained vehicle, though the need to address the exhaust system deficiency promptly is critical to prevent further emissions-related issues or potential warranty claims. The vehicle’s recorded mileage of 63,776 miles at this point represents a moderate annual usage rate of approximately 6,378 miles per year, which is consistent with typical driving patterns for a ten-year-old M4. This level of mileage does not suggest excessive wear from high annual mileage, but it also does not indicate minimal use either. The gaps between MOT tests—particularly the two-year interval between 2024 and 2026—could imply periods of inactivity, which may have contributed to minor standing-related issues such as brake pad corrosion or fluid degradation. However, the absence of high-mileage wear symptoms like excessive suspension or drivetrain noise suggests that the vehicle has not been subjected to particularly harsh conditions. For a ten-year-old car, this mileage profile is reasonable, but the need to monitor for potential standing-related wear, such as binding brake calipers or fluid leaks, remains prudent. For the prospective buyer, the most urgent concern is the unresolved exhaust emissions failure from the 2026 MOT, which must be rectified before the vehicle passes its next test. The Lambda sensor or catalytic converter issue could lead to increased emissions output, reduced fuel efficiency, and potential penalties for non-compliance. A thorough inspection of the exhaust system, including the sensor wiring, connectors, and catalytic converter efficiency, is essential. Listen for unusual exhaust noises or a rough idle during a test drive, as these may indicate underlying problems with the sensor or exhaust manifold. Additionally, check for any warning lights on the dashboard that relate to the engine control system, as these could provide further clues about the root cause. Beyond the exhaust system, the tyre advisories from previous MOTs—particularly the worn edges and near-legal limits—highlight a need for closer inspection. Tyres worn on the edges rather than centrally may indicate misalignment, incorrect tyre pressure, or suspension issues. On a test drive, check for uneven tyre wear patterns, which could suggest steering or suspension problems. Measure the tyre tread depth and inspect the sidewall for cracks or perishing, as these can compromise safety and handling, especially on older vehicles. Given the vehicle’s age, it is also advisable to verify the condition of the 12-volt battery, as prolonged inactivity can lead to corrosion or failure. Check for signs of corrosion on battery terminals and test the battery’s charge capacity. Finally, consider a comprehensive fluid check, including brake fluid, coolant, and transmission fluid, as these fluids degrade over time, even with regular use. Ensure service records are up to date, particularly for the timing belt, if applicable, and any scheduled maintenance such as suspension bush replacements or brake system servicing.