2009 Mercedes C 3.0L Diesel · KR09 KKC

A pattern of front suspension wear is the defining mechanical story of this 2009 Mercedes C-Class, with the vehicle presenting to test in April 2025 having passed, but its prior history shows a serious front-end episode that warrants close attention. On 25 March 2022 the car failed on both nearside and offside front suspension arm ball joints being excessively worn, alongside both headlamp aim defects, meaning every front ball joint in the wishbone assembly was condemned at the same mileage point. The subsequent retest on the same day recorded a clean pass with no advisories, confirming the rectification work was completed to a satisfactory standard. The most recent examination on 2 April 2025 then passed with three advisories covering front brake pipe corrosion, a non-excessive oil leak, and the presence of undertrays obscuring certain components. The overall trajectory suggests the major suspension faults have been resolved, but the brake pipe advisory indicates an evolving corrosion concern at the front braking hydraulic circuit that should be monitored at each subsequent test. At 116,219 recorded miles over roughly seventeen years of use, this C-Class is averaging approximately 6,800 miles per annum, which is broadly typical for a vehicle of its age and consistent with regular but unremarkable daily use rather than long-term storage or high-mileage motorway work. There is a notable three-year gap in the recorded MOT history between the 2022 tests and the 2025 examination, which likely reflects either an exemption period as a vehicle of historic interest becomes closer, a period off the road requiring no test, or simply a gap in DVSA records during which the car was used without a mandatory test certificate. Mechanically, the mileage profile means consumables such as brake discs, pads, tyres, and suspension bushes will have seen multiple replacement cycles already, and an inspection should confirm that any components renewed were of equivalent OE specification rather than budget alternatives that tend to wear prematurely on a car of this weight class. A prospective buyer should focus any pre-purchase inspection on the front suspension geometry in particular, as the simultaneous failure of both ball joints in 2022 is an unusual event that could indicate underlying corrosion in the surrounding subframe or lower wishbone mounting points. On a test drive, listen for any clonking or knocking from the front wheels over speed humps and uneven surfaces, and pay attention to vague steering response, irregular tyre wear on the front pair, or a shimmy through the wheel when braking, all of which would suggest the replacement arms have themselves worn prematurely or were fitted without alignment correction. The brake pipe advisory from 2025 should be physically inspected at the front of the vehicle, looking for any flaking, pitting, or swelling along the flexible sections and rigid lines, as brake pipe corrosion is a progressive failure mode that will result in a future major defect if left untreated. An oil leak, although classed as not excessive, should be traced to its source, with common culprits on this era of Mercedes including the valve cover gasket, oil filter housing, and rear main seal, all of which become more invasive to repair as mileage accrues. The headlamp aim failures from 2022 are worth verifying as a one-off alignment issue rather than evidence of a damaged headlamp bracket or corrosion in the adjuster mechanism, which on a C-Class of this vintage can seize and cause persistent beam pattern problems. Check that both headlamps sit level and produce a sharp horizontal cut-off on a flat wall in dark conditions, and confirm the manual or automatic levelling system operates correctly across the full range. The presence of undertrays noted at the 2025 test means an inspector could not fully view the engine, gearbox, and front subframe, so any prospective purchase should include a removal of these panels for a thorough underneath examination, with particular emphasis on subframe integrity, steering rack condition, and exhaust mounting points. Given the age and mileage, a compression test or at minimum a thorough cold-start observation would also help confirm the internal health of the engine given the recorded oil leak.