2012 BMW 520 2.0L Diesel · AX12 HEV

The defining mechanical thread across this 520's MOT history is a brake and tyre wear pattern that has surfaced repeatedly alongside a now-flagged front suspension joint. The most recent test on 27 May 2026 passed, but recorded an advisory for slight play in the offside front lower suspension arm ball joint, an early sign of wear that warrants monitoring. Prior to that, the vehicle failed on 23 May 2025 with major defects for cuts exceeding legal depth on the nearside front tyre and both rear tyres, accompanied by an advisory noting all three of those tyres were worn close to the legal limit and a further advisory for light brake pad wear. A more serious episode occurred on 15 April 2024, when the car failed with a dangerous nearside front brake pad reading below 1.5 mm, a nearside brake pad worn down to its wear indicator, and a major malfunction indicator lamp (MIL) defect, alongside an advisory for front brake disc pitting and scoring. The intervening tests in 2024, 2025, and 2026 returned to clean passes, but the cumulative pattern suggests that consumables on this car have at times been allowed to run very close to, or beyond, the legal threshold. Mileage accumulation is broadly consistent with the vehicle's age, with 126,838 miles recorded across roughly 14 years, equating to an average of around 9,060 miles per year. There are no extended gaps in the testing record that would imply long periods off the road, although the cadence between tests has occasionally been compressed, as seen in 2025 when a failed test on 23 May was followed by a retest pass just seven days later. For a diesel or petrol 520d/520i of this vintage operating at a typical annual mileage, the recorded usage points to normal wear rates on friction materials, tyres, and suspension components rather than the accelerated degradation often associated with high-mileage commercial use, but it also means none of those consumables can be assumed to be in the early stages of their service life. A prospective buyer should treat the front brake system as the primary area for physical inspection. The April 2024 entry recorded a dangerously thin nearside front pad under 1.5 mm together with pitted and scored front discs, which raises the question of whether the discs were skimmed or replaced at the time and what condition they are in now. On a test drive, listen for any scraping or grinding noise from the front wheels under light braking, feel for vibration or judder through the brake pedal which would indicate disc runout or uneven wear, and check that the vehicle pulls up squarely without pulling to one side which might point to a binding caliper. Inspect both inner and outer pad faces through the wheel spokes, and examine the disc surfaces for a pronounced lip at the outer edge, a reliable proxy for remaining friction material. The 2026 advisory for play in the offside front lower suspension arm ball joint is the second suspension-related flag worth chasing down. With the car jacked, the offside front wheel should be rocked vertically and horizontally to detect any knocking or looseness, and the same test repeated on the nearside for comparison. On the road, slow-speed driving over speed humps and broken tarmac will reveal clonking or rattling from the front end if the joint has deteriorated further, while uneven tyre wear particularly on the inner or outer edges of the front tyres would corroborate geometry being thrown out by worn linkages. Finally, the April 2024 MIL inoperative or malfunction indication should be cleared up with a diagnostic read, as a permanently illuminated or inoperative lamp could mask an active emissions or engine management fault, and any reappearance of the warning during a pre-purchase test drive should be treated as a reason to walk away until the underlying fault is identified and rectified.