2007 BMW 520 2.0L Diesel · SP07 URA

A recurring theme runs through the MOT history of this 2007 BMW 520, with the supplementary restraint system (SRS) warning lamp appearing as a failure item at both the 2019 and 2021 tests, and a related warning lamp non-illumination advisory logged in 2020. The 2021 test on 18 October passed but was shadowed by a same-day failure covering that exact SRS lamp fault alongside a parking brake efficiency issue below the required standard. Beyond these safety system concerns, the 2018 test produced a dangerous rear tyre tread depth failure at 1.6 mm, plus anti-roll bar linkage ball joint dust cover failures on both sides, while the 2019 test added brake disc scoring on all four corners, light shock absorber oil misting on the offside front, rear suspension arm pin or bush wear on both sides, and a noted slight rear differential oil leak. The most recent pass in October 2021 came with no recorded defects, but the broader pattern points to a vehicle carrying multiple latent advisories that have yet to be resolved and a repeated SRS-related electrical fault that has resurfaced across consecutive test cycles. At 146,693 miles over roughly nineteen years, the recorded accumulation works out at around 7,721 miles annually, which sits broadly in line with what one would expect for a car of this age and likely prior use as long-distance or commuter transport. The MOT history is not continuous from 2017 onwards, with gaps between the 2017, 2018, 2019, 2020 and 2021 entries all clustered within autumn months, suggesting regular annual attendance at test rather than extended periods off the road. There are no obvious multi-year lay-ups recorded in this dataset, so the components flagged across the advisories should be read as wear accumulated from active service rather than deterioration from standing. The mileage itself is high for a nineteen year old vehicle, meaning consumable wear on braking components, suspension bushes and drivetrain seals is consistent with the kind of fatigue already showing in the test record. For a prospective buyer, the supplementary restraint system warning lamp fault is the single most pressing item to investigate, as it has triggered or been flagged at three consecutive tests covering 2019, 2020 and 2021. A diagnostic scan of the SRS module using a BMW-compatible tool such as ISTA or a capable OBD reader is essential to determine whether this points to a failed airbag squib, a seatbelt pretensioner fault, a crash sensor issue, or simply a previous battery disconnection that was not properly cleared. Equally, the parking brake efficiency failure from October 2021 needs confirming as a completed repair rather than an unresolved entry, and the caliper, handbrake mechanism and rear cable adjustment should be physically inspected on a ramp. On a test drive, the brake pedal should feel firm without excessive travel or judder under load given the brake disc scoring advisories, while the rear parking brake should hold the vehicle on a moderate incline without creeping. The suspension and drivetrain advisories deserve a hands-on inspection rather than a road test alone. With light oil misting previously recorded on the offside front shock absorber, a close look at the damper body for fresh seepage and a check that the front of the car does not bounce excessively over speed humps is worthwhile. The rear suspension arm pin or bush wear on both sides, combined with the 2018 anti-roll bar ball joint dust cover failures, suggests the front and rear bushing and link packages may now be due for replacement, and any clonking, knocking or vagueness through the steering over uneven surfaces should be taken seriously. The noted slight rear differential oil leak should be inspected with the underside clean, looking for fresh seepage at the differential cover, pinion seal and output flanges, as continued loss will eventually lead to pinion bearing wear. Finally, the offside rear tyre advisory from 2018 regarding wear on the edge suggests a possible tracking or suspension geometry issue that may have resurfaced, so all four tyres should be checked for uneven inner or outer shoulder wear before purchase.