2012 Mercedes-Benz E 2.1L Diesel · WM12 HDA

This 2012 Mercedes-Benz E-Class presents a roadworthiness record defined by recurring concerns around tyres, braking components, and front wheel bearings, with the most recent assessment on 30 October 2023 passing without recorded defects. Six MOT tests are documented over a five-year span, and while the latest result is clean, the earlier history is mixed. Two failures were recorded within that window, including a dangerous defect on 27 March 2023 for rear brake pad(s) less than 1.5 mm thick, and an earlier failure on 21 February 2022 citing dangerous rear tyre tread depths below 1.6mm, an inoperative engine management indicator, visible diesel particulate filter smoke, and a non-functioning offside rear direction indicator. Front wheel bearing play has surfaced as advisories on both nearside and offside sides across consecutive 2020 tests, and rear tyre wear advisories have appeared in 2019 and again in 2023, suggesting these are areas of chronic attention rather than isolated incidents. With 156,140 miles recorded over roughly fourteen years, the vehicle accumulates around 11,000 miles annually, which is broadly typical for its age. The testing history shows some notable gaps, most prominently the absence of recorded tests between July 2018 and February 2022, a period of nearly three and a half years. Such a gap does not necessarily indicate standing time, as vehicles exempt from MOT testing after passing in their first three years would not generate records, but the mileage implications for a diesel of this vintage remain relevant. Diesel E-Class models with this level of annual use place sustained demand on dual-mass flywheels, turbocharger components, injector seals, and DPF systems, the latter having already flagged a visible smoke defect during the 2022 test. Prospective buyers should focus their inspection on the components that have generated repeated flags. The persistent front wheel bearing advisories warrant careful attention on a test drive: listen for a humming or droning noise that changes with vehicle speed and cornering, as this typically indicates progression beyond the slight play previously recorded. The 2023 dangerous brake pad failure means the rear braking system should be physically inspected for pad thickness, caliper slide pin operation, and disc condition, with the pedal feel checked for any sponginess or pulling under braking. Given the rear tyre wear pattern noted across multiple tests, examine the rear axle for any uneven camber or suspension geometry issues, and inspect the springs and shock absorbers for signs of sagging or leakage. The diesel-specific concerns raised in the 2022 failure require targeted checks. A functioning engine management light, absence of excessive exhaust smoke particularly under load, and DPF condition are essential, as the recorded DPF emission defect can indicate incomplete regeneration cycles, often linked to short urban journeys or a failing pressure sensor. Inspect the underside for oil leaks from the sump, injector seals, and turbo connections, and check the coolant system for any signs of crusting around the expansion tank or radiator, which is common on higher-mileage Mercedes diesel units. Finally, verify operation of all direction indicators and lighting, given the recorded 2022 indicator failure, and confirm the exhaust emits no more than light vapour during normal operation, as the 2023 advisory noted excessive smoke or vapour that did not yet obscure visibility but warrants monitoring.