2009 Mercedes-Benz A-Class 1.7L Diesel · LL59 YRV

A 2009 Mercedes-Benz A-Class carrying 75,718 miles presents a mixed mechanical picture, with the most recent test on 19 December 2025 recording a pass but only after a prior fail nine days earlier that raised two major defects alongside the same clouded headlamp lenses that have lingered as a minor item across both 2025 entries. The 2025 fail centred on an inoperative or malfunctioning engine management indicator lamp (commonly referred to as the MIL or check engine light) and a nearside side repeater in the mirror housing that was not illuminating with sufficient intensity, both of which are emissions and visibility-related items that must be cleared for the vehicle to be deemed roadworthy. Beneath these immediate concerns, the underlying history is reasonably stable: passes recorded in 2020, 2021, 2022 and 2024 all carried no advisories, indicating that the recent cluster of issues represents a departure from a previously clean trend rather than a long-standing pattern. The November 2023 test did, however, produce both an advisory for wear and pitting on both front brake discs and a failure item for an offside front headlamp aim that was too far to the right, showing that braking and lighting concerns have surfaced intermittently throughout the recorded period. The annual mileage accumulation of roughly 4,454 miles over seventeen years places this A-Class firmly in low-use territory, with recorded tests spread across 2020, 2021, 2022, 2023, 2024 and 2025 reflecting reasonably consistent annual presentation rather than a long lay-up followed by rushed use. Mechanically, low-mileage vehicles of this age often exhibit stiffness in rubber components such as suspension bushes, anti-roll bar links and engine mountings, as well as corrosion setting into brake disc surfaces and calliper slide mechanisms due to infrequent rather than heavy use. The advisory pitting noted on the front discs in 2023 is consistent with this pattern, as surface corrosion develops rapidly on lightly used cars and is usually cleared by normal driving, but can accelerate pad wear and produce brake pedal shudder under heavy braking if the corrosion becomes more entrenched over time. The relatively even spread of mileage across tests suggests the vehicle has been in regular but light service, which is typical of a second car or short-journey commuter. A prospective buyer should prioritise a thorough investigation of the headlamp and engine management systems that caused the December 2025 failure, as a reappearing MIL can indicate underlying faults ranging from oxygen sensor degradation and catalytic converter efficiency issues to evap system leaks, and it is essential to confirm that any diagnostic trouble codes have been properly read, rectified and cleared rather than simply suppressed. The mirror-mounted side repeater should be inspected for water ingress, broken solder joints or a failed LED module, all common failure modes on older Mercedes units, and both headlamp lenses should be assessed for UV degradation and internal moisture that would explain the persistent clouding noted on successive tests. On a road test, particular attention should be paid to brake pedal feel, watching for vibration or judder through the pedal under moderate deceleration that would indicate the front disc pitting has progressed since the 2023 advisory, and listening for any graunching or binding from the front callipers that suggests seized slide pins given the low annual mileage. Beyond the flagged items, a careful inspection of the underbody and suspension is warranted on a car of this vintage, paying close attention to corrosion on brake pipes, the rear subframe mounting points and the front MacPherson strut top mounts, all known wear areas on the W169 A-Class platform as it enters its late teens. The exhaust system should be checked for blowing joints and corrosion around the catalytic converter housing, while the engine and gearbox oil should be inspected for any signs of emulsion or metallic residue that would suggest seal degradation or internal wear. A road test should include a section of broken urban surfaces to expose any knocking from worn suspension links or top mounts, and a steady-state motorway cruise to confirm that the engine management light remains extinguished and that there is no rough running, hesitation or excessive vibration from the drivetrain. Taken together, the record indicates a fundamentally roadworthy vehicle whose most recent test issues should be addressed promptly but whose overall history is not one of chronic mechanical failure.