2016 BMW 420 2.0L Diesel · KN10 ADS

The most recent MOT test on November 21, 2025, confirms the vehicle passed without defects, though it is notable that the test was conducted just four miles before a failure was recorded on the same day—an anomaly that suggests either a temporary administrative error or a very brief period of non-compliance before rectification. The preceding MOT history from 2022 to 2024 shows consistent pass results with no recurring faults, indicating a stable maintenance record over the past four years. The absence of advisories or repeated failures on critical systems like suspension, brakes, or emissions implies that major components have not been neglected, though the lack of defects does not preclude hidden wear or deferred maintenance on non-MOT-tested areas. The recorded mileage progression reveals a steady accumulation of approximately 8,000 miles annually, which aligns with typical usage for a vehicle of this age. The gap between the 2022 and 2023 tests—where mileage increased by just 3,000 miles in a year—could suggest a period of reduced usage or storage, though this does not inherently indicate poor care. The most recent 12-month interval, from 58,964 to 80,068 miles, shows a return to more typical mileage accumulation, though the abrupt failure and immediate pass on the same day warrants scrutiny of whether any critical components were serviced or replaced between those tests. Given the clean MOT record, a buyer should prioritise an independent inspection of suspension components, particularly the rear axle and bushes, as BMW 4-series vehicles of this era are prone to wear in these areas. The brakes, while not explicitly failed, should be assessed for uneven pad thickness or warped discs, especially if the vehicle has been driven aggressively. Corrosion checks are essential, focusing on wheel arches, subframes, and the sills, as prolonged storage or exposure to salt could compromise structural integrity. Finally, the engine bay should be examined for leaks, particularly around the oil and coolant systems, as the absence of MOT advisories does not rule out gradual degradation in these areas.