2017 BMW 420 2.0L Diesel · FD67 WLU

The vehicle most recently passed its MOT on 11 July 2026 with no defects or advisories recorded, continuing a pattern of clean test results that has prevailed for the majority of its recorded inspection history. Looking across the full DVSA timeline, the only meaningful interruption to this clean trend occurred in 2021 and 2024, when a pair of advisories relating to steering rack inner joint play and brake disc wear were flagged alongside tyre-related observations in 2020. The fact that no further advisories have been raised in the two most recent tests suggests that the steering component, while still showing measurable movement at the last relevant test, has not deteriorated to a point requiring failure, and the brake discs noted as worn but not excessively in 2024 have evidently not required immediate replacement. Overall, the maintenance trend appears stable, with the latest pass indicating consistent attention to the vehicle's roadworthiness, though prospective buyers should not interpret the absence of recent advisories as conclusive proof that the previously flagged components have been rectified. The recorded mileage of 81,783 miles over approximately nine years equates to an annual average of around 9,087 miles, which is broadly typical for a vehicle of this age and represents regular rather than sporadic use. This level of usage implies that mechanical components have been subjected to normal wear cycles, with consumables such as brake pads, discs, tyres, and fluid services requiring attention at intervals consistent with moderate driving. There are no evident gaps in the mileage progression that would suggest extended periods of standing, which reduces the likelihood of issues commonly associated with low-use vehicles such as brake caliper seizure, tyre sidewall perishing, or 12V battery degradation from infrequent charging. However, the mileage is sufficient to warrant careful inspection of items that wear progressively with distance covered, including the clutch, dual-mass flywheel if manual, automatic transmission fluid if automatic, and the condition of the turbocharger and associated oil supply lines on the petrol and diesel variants offered in this model range. Test drive behaviour should therefore be evaluated with an awareness that higher-mileage specific components may now be approaching the latter portion of their service life. Although the most recent MOT was entirely free of advisories, the recurring steering rack inner joint observation from 2021 and 2024 warrants specific attention during pre-purchase evaluation. Steering rack inner joint play typically manifests as a slight knocking or clunking noise transmitted through the steering wheel when traversing uneven surfaces, speed humps, or during low-speed manoeuvring, and it can be detected by rocking the steering wheel with the vehicle stationary and the wheels off the ground, or by listening carefully during a test drive over broken road surfaces. While the test centre recorded this as an advisory rather than a failure, repeated observation across multiple tests suggests the wear is progressive rather than incidental, and a reputable inspection should include a physical check of the inner tie rod ends and rack mounting bushes for any worsening movement. Similarly, the 2024 advisory concerning brake disc wear, although deemed not excessive at that point, indicates that the discs have measurable wear and may now be approaching the minimum thickness specification, particularly if the vehicle has covered significant mileage since. A test drive should include several firm brake applications from speed to check for brake pedal pulsation or shudder, which would indicate disc warping, and the vehicle should be inspected from beneath for any scoring on the disc friction surfaces or uneven pad wear. Beyond the advisory history, a buyer should conduct age and mileage appropriate checks even in the absence of specific defects. Despite the recorded MOT clean pass in July 2026, tyres should be inspected closely for any signs of sidewall cracking, perishing, or uneven tread wear, particularly given the 2020 and 2021 advisories noting edge wear and tyre damage respectively; age-related rubber degradation can occur independently of tread depth. The 12V battery should be tested for state of charge and cranking performance, as battery replacement intervals on vehicles of this age typically fall between five and seven years, and a weak battery can cause a range of electronic faults on modern BMW systems. Brake fluid, coolant, and if applicable automatic transmission fluid, should be verified as recently serviced according to calendar-based intervals rather than purely mileage, as moisture absorption in brake fluid and degradation of coolant additive packages occur with time. Finally, given that this is a nine-year-old BMW 4 Series, particular attention should be paid to oil leaks from the valve cover gasket, oil filter housing, and rear main seal, as well as the condition of the timing chain or belt depending on engine variant, the operation of all electronic systems including iDrive, climate control, and parking sensors, and a thorough visual inspection of the underside for any corrosion affecting suspension components, exhaust mounting rubbers, or structural areas, which although not flagged in MOT history, may not have been fully visible at the time of test.