2009 Mercedes A-Class 2.0L Diesel · KN09 LXF

The 2009 Mercedes A-Class presents a mixed maintenance picture, with the most recent MOT on 9 October 2024 passing at 83,993 miles only after a failure on the same day. That initial failure flagged excessive exhaust emissions, a split offside front CV boot, corroded brake pipework, worn tyre edges, a corroded fuel filler neck, and play in the offside steering rack inner joint. The pass recorded on the same date suggests these items were addressed, yet the underlying pattern reveals a vehicle that has repeatedly required remedial work to meet the standard rather than one maintained proactively. The trend is not clearly improving; it is stable at best, with recurring corrosion and wear items appearing across multiple test cycles. At roughly 4,941 miles per year, the recorded mileage is low for a seventeen-year-old vehicle. The annual test history shows consistent MOT events each October from 2022 through 2024, with mileage climbing from 76,934 to 83,993 over that two-year window, averaging around 3,500 miles per year in the most recent period. There are no alarming gaps in the test record, and the mileage progression appears steady rather than erratic. Low annual use, however, can mask long periods of inactivity, which itself accelerates brake pipe corrosion, tyre sidewall deterioration, and fuel system degradation, all of which feature prominently in this record. Buyers should pay close attention to the corrosion history. The nearside and rear brake pipes have been flagged for corrosion covered in grease or other material in both 2023 and 2024, and the fuel filler neck was noted as corroded in 2024. These are not isolated minor advisories; they indicate moisture retention and possible underbody neglect. A thorough underside inspection is essential, focusing on brake line condition, fuel pipe integrity, and the general state of structural corrosion around the sills, subframes, and suspension mounting points. The repeated appearance of worn tyre edges on both front axles across multiple years also warrants a close look at suspension geometry. Worn front suspension arm ball joints were identified in the 2023 failure, and both front shock absorbers were flagged for reduced damping effect in 2022. If these components were replaced, the alignment should be verified; if not, uneven tyre wear will persist and handling will suffer. The steering rack play noted on the offside in 2024 and the split CV boot on the same side point to a vehicle that has seen patchy attention rather than systematic upkeep. A prospective buyer should test-drive the car specifically for steering vagueness, knocking over uneven surfaces, and any vibration under acceleration that might indicate a compromised CV joint. The exhaust emissions failure in 2024 raises questions about engine health or catalytic converter efficiency that a pre-purchase compression test and live emissions reading would help clarify. Overall, this A-Class has been kept legal but not necessarily well maintained, and a careful independent inspection is strongly advised before purchase.