2016 Mercedes-Benz A-Class 1.6L Petrol · OW66 SDO

A recurring thread across the MOT history of this 2016 Mercedes-Benz A-Class is brake and tyre wear, with the most recent pass on 22 July 2026 carrying an advisory for rear brake discs that are worn, pitted or scored on both sides. That advisory sits at the end of a sequence that includes a clean pass in July 2025 immediately following a failure the same month for an inoperative or malfunction-indicating engine management warning lamp (MIL). The 2025 MIL failure is the only major defect recorded in the seven tests shown, and the vehicle has otherwise passed consistently since a 2022 dangerous failure for front tyre tread depth below the legal 1.6mm limit on both sides. The overall pattern is one of generally acceptable roadworthiness with one notable emissions/dashboard warning issue, several brake-related advisories spanning multiple axles, and a tyre compliance failure that warranted a dangerous categorisation. Annual mileage sits at approximately 12,637 miles over the vehicle's ten-year life, which is high for a car of this age and well above the typical 7,000 to 9,000 miles per year expected of an A-Class of this vintage. Testing has been regular and roughly annual, with no multi-year gaps in the recorded history, indicating the car has been in continuous use rather than laid up for extended periods. High accumulated mileage on a turbocharged Mercedes of this era places proportionate wear on items not always visible at MOT, including the dual-clutch or automatic transmission mechatronics, turbocharger bearings, dual-mass flywheel (where applicable), and engine oil control seals, as well as accelerating the natural degradation of suspension bushes, anti-roll bar drop links and engine mounts. Brake component wear observed at multiple tests is consistent with this usage level, particularly on a vehicle that may have seen a higher proportion of urban or stop-start driving. For a prospective buyer, the front and rear brake pad advisories from 2023 and the 2026 rear brake disc advisory should drive a focused inspection of the entire braking system. Both front and rear pads were flagged as wearing thin together in 2023, suggesting the car is likely to be due for replacement again given the mileage accrued since; on a test drive, listen for any metallic grinding or squeal under light braking, and feel for vibration or judder through the pedal that would indicate the pitted rear discs have worn beyond their service limit. The nearside and offside rear tyre advisories in 2021, combined with the dangerous tread-depth failure on both fronts in 2022, point to a vehicle that may have been driven on under-inflated or poorly aligned wheels at times; check for uneven shoulder wear on any remaining tyres and confirm there is no pulling to one side under steady cruising. The 2025 MIL failure warrants particular attention, as Mercedes A-Class dashboard warning faults can stem from anything as simple as a faulty sensor or as serious as lambda probe, EGR or catalytic converter efficiency issues, so a pre-purchase diagnostic read of all stored fault codes is essential, and the test drive should be monitored for any re-illumination of the engine management lamp, hesitation under throttle, or elevated idle. Given the high overall mileage, it is also worth inspecting the more age-related mechanical items that MOT testing does not cover in depth. Listen for clonks or knocks from the front suspension over speed bumps and uneven surfaces, which on a high-mileage A-Class commonly indicate worn lower wishbone bushes, anti-roll bar links or top mount deterioration. With the engine cold at startup, listen for any timing chain rattle from the right-hand side of the engine bay, as Mercedes M270 series units are known for chain stretch at high mileage. Inspect the underside for any oil residue around the sump, turbo oil feed lines and front crank seal, and check the coolant expansion tank for the typical yellow staining that suggests a slow head gasket or water pump weep. Finally, a thick diagnostic snapshot from a Mercedes-capable reader covering transmission adaptation values, turbocharger boost deviation and any historic emissions-related fault codes will give a far more complete picture than the MOT record alone, particularly in light of the recorded engine management lamp failure in 2025.