2018 BMW 420 2.0L Diesel · F2 MDR

Rear brake disc wear emerges as the sole recurring mechanical note, with advisories on both nearside and off‑side rear discs recorded at the 2024 MOT, while every other test since 2022 has resulted in a pass and the lone 2022 failure for a non‑functioning horn appears to have been remedied. This pattern suggests a generally sound roadworthiness record punctuated by a single, now‑addressed, safety defect and early signs of rear‑disc thinning. At 48,458 mi over eight years the vehicle averages roughly 6,000 mi per annum, a mileage level that sits comfortably within typical usage for a 2018 model. The absence of any large mileage spikes or prolonged gaps between tests indicates consistent annual running rather than periods of storage, meaning consumables such as tyres, brakes and suspension components are likely to have experienced normal wear rather than accelerated degradation. Prospective buyers should give the rear braking system close attention. Verify disc thickness against the manufacturer’s minimum specification, inspect for surface scoring or uneven wear, and listen for any pulsation or squeal under moderate braking during a test drive. A juddering pedal or a noticeable change in braking balance between the left and right rear wheels would corroborate the MOT advisories and may signal the need for disc resurfacing or replacement, possibly accompanied by new pads and a check of the rear caliper operation. Confirm that the horn now operates correctly, as the 2022 major failure would have required a repair to pass. While the engine‑under‑tray and sill‑trim advisories do not affect safety, they hint at prior bodywork; a visual inspection of the underbody for corrosion, loose fittings or fluid leaks, and a brief walk‑around for rattles, will ensure no hidden issues remain before committing to purchase.