2018 BMW 1 Series 3.0L Petrol · PL67 ESO

Recurring exhaust system issues and emissions failures represent the primary mechanical concern for this vehicle, as evidenced by the failure on 9 December 2025 for carbon monoxide content exceeding manufacturer limits. This failure was accompanied by an advisory regarding a noisy exhaust, a condition that has been noted in consecutive tests dating back to December 2024. While the vehicle passed its most recent test on the same date in December 2025, the persistent noise and the previous emissions failure suggest a potential ongoing issue with the exhaust assembly, catalytic converter, or engine management systems that requires close scrutiny. The vehicle has covered 60,871 miles over its eight-year lifespan, averaging approximately 7,609 miles per year. This mileage accumulation is consistent with typical UK usage patterns for a vehicle of this age. Such a steady rate of use suggests that components have been subjected to regular, predictable wear rather than the extreme stress of high-mileage motorway driving or the potential degradation associated with long periods of inactivity. However, the mileage is sufficient to have necessitated the tyre replacements and related advisories noted in the November 2023 test. Prospective buyers should pay particular attention to the exhaust system during a test drive. Listen for irregular vibrations, loud droning, or changes in engine note that could indicate a leak in the manifold, a failing catalytic converter, or loose mounting brackets. Given the previous failure regarding carbon monoxide levels, it is prudent to monitor the engine's idling stability and check for any hesitation or stumbling during acceleration, which could relate to the combustion process or sensor malfunctions. The 2023 MOT history also highlighted significant tyre wear and signs of perishing across all tyres, specifically noting edge wear and cracking on the shoulders. While these may have been addressed, any remaining or new tyres should be inspected for uneven tread patterns or sidewall cracking. On the test drive, check for any steering pull or vibration at motorway speeds, which could indicate alignment issues or uneven tyre wear, and ensure the braking performance is smooth without any undue noise that might suggest related suspension or wheel bearing issues.