2009 BMW 520 2.0L Diesel · YC59 NKJ

The BMW 520d’s MOT history presents a stable but concerning pattern of repeated failures without recorded defects, culminating in the most recent tests on 2025-03-28 at 148,333 miles. Both the pass and fail entries for March 2025 share identical mileage, suggesting the vehicle was re-tested immediately after a minor issue—likely an administrative or procedural oversight rather than a mechanical failure. The absence of any defects in the past three tests, despite two failures, implies the car meets basic roadworthiness standards but may have been subject to superficial checks. The last valid pass in October 2022 at 123,145 miles, followed by another pair of pass/fail entries at the same mileage, reinforces this trend of borderline compliance without substantive repairs being logged. No advisories or defects appear in the record, yet the repeated retests hint at potential issues being overlooked or resolved just before inspection. The mileage accumulation of 148,333 miles over 17 years averages roughly 8,725 miles annually, which aligns with typical usage for a vehicle of this age. However, the significant gap between the 2022 tests (October 11) and the 2024 retest (March 12) suggests the car sat unused for nearly two years—covering just 16,269 miles in that period. Such prolonged inactivity can exacerbate issues like seized suspension bushes, degraded seals, or binding brakes, particularly in a BMW’s rear-wheel-drive layout. The lack of mileage progression between the 2025 tests further implies recent minimal use, raising questions about whether the vehicle has been driven regularly enough to identify latent problems. Given the absence of recorded defects, a buyer should prioritise a thorough inspection of components prone to silent degradation in low-mileage, older BMWs. The rear suspension—particularly the coil springs, bushings, and track control arms—should be checked for wear or corrosion, as these often fail without obvious symptoms. Binding rear brakes, a common issue in BMWs with rear disc setups, may have been present but not flagged; inspect the calipers, pads, and discs for uneven wear or seized pistons. Structural integrity is also critical: examine the sills, wheel arches, and subframe for corrosion, especially if the car has spent time in damp conditions. While the MOT history suggests no major failures, the repeated retests without explanation warrant closer scrutiny of systems that might have been temporarily compliant at test time but are deteriorating beneath the surface.