2017 BMW 420 2.0L Diesel · CV17 VVT

The most recent MOT test on 2026-01-10 resulted in a clean pass, marking a return to a stable maintenance status after a single failure in 2025-01-03. The vehicle’s history reflects a pattern of consistent compliance with roadworthiness standards, with no further defects recorded since the 2025 failure, which included a major issue with excessive wear in the nearside front lower suspension arm pin or bush. This wear suggests progressive deterioration likely linked to prolonged stress on the component, possibly exacerbated by misalignment, excessive load, or poor lubrication. The advisories from that test—front brake disc pitting, thin brake pads, and insufficient washer fluid—were not repeated, implying either corrective action was taken or the conditions were transient. The absence of subsequent failures indicates either effective remedial work or that the vehicle’s suspension and braking systems have since stabilised, though vigilance remains warranted. The recorded mileage of 61,973 miles for a 2017 BMW 420 represents a moderate annual usage rate of approximately 6,886 miles per year, which is within the expected range for its age and class. This figure does not suggest either extreme wear from high mileage or prolonged idleness, though the gap between the 2020 and 2021 MOTs—over a year without testing—could indicate periods of reduced use or storage. While lower mileage might imply less mechanical stress, the suspension arm failure highlights that even moderate usage can accelerate component wear, particularly in high-stress areas like the front lower control arms. The drivetrain, exhaust, and electrical systems may also show signs of gradual degradation over time, but the absence of high-mileage-related failures in recent tests suggests these areas are currently compliant. Given the 2025 MOT failure history, the prospective buyer should prioritise a thorough inspection of the front suspension and braking systems. On a test drive, listen for unusual clunking or rattling noises from the nearside front suspension, which may indicate further wear in the arm bushings or pin bearings. Check for uneven tyre wear patterns, particularly on the inner edges of the front tyres, which could signal misalignment or suspension issues. Inspect the front brake discs for signs of warping, scoring, or excessive thickness loss beyond the 3mm threshold noted in the advisory. If the brake pads are thin, consider replacing them immediately to prevent disc damage and maintain braking performance. Additionally, verify that the washer fluid reservoir is topped up and that the washer nozzle is not obstructed, as the 2025 failure highlighted a functional issue in this area. For broader due diligence, the buyer should examine the vehicle’s tyre condition for sidewall cracking or perishing, which can occur even at moderate mileage due to age and exposure to UV light. Check the 12-volt battery for signs of corrosion around terminals, poor connection, or reduced cranking power, as BMWs often suffer from battery degradation over time. Inspect the exhaust system for rust or leaks, particularly around the catalytic converter and tailpipe, and verify that emissions levels are not degrading, though this may not be checked in a routine MOT. Review the service history for the suspension arm replacement and ensure that all fluid levels—brake, coolant, and transmission—are topped up and free from contamination. Given the vehicle’s age, consider scheduling a comprehensive mechanical inspection within the next 6 to 12 months, focusing on the suspension, braking, and drivetrain components, to address any latent issues before they escalate.