2005 Mercedes-Benz C 1.8L Petrol · KN55 YFX

The vehicle presents a complex roadworthiness profile where the maintenance history reveals a trend of deteriorating suspension and emissions issues. While the most recent test in August 2025 at 69,258 miles passed, it carried over advisories for corrosion on the rear sub-frame and both coil springs. The failure in July 2025 at 69,226 miles highlighted significant exhaust performance issues, specifically carbon monoxide and lambda readings exceeding manufacturer limits, suggesting an engine management or sensor fault that required immediate attention to achieve the subsequent pass just three weeks later. At 21 years old, the recorded mileage of 69,258 miles is exceptionally low, averaging approximately 3,300 miles per year. This low usage often correlates with the degradation of rubber components and metal rather than mechanical wear from distance. The gap between July 2023 at 59,343 miles and July 2024 at 67,248 miles shows a period of nearly 8,000 miles, which is sufficient to have revealed the fractured front coil spring and worn suspension arm ball joint recorded in the July 2024 failure. The suspension history shows a persistent pattern of corrosion and failure. The tester flagged corroded rear springs in 2024 and 2025, following a fractured front spring failure in mid-2024. The presence of corrosion on the rear sub-frame in the 2025 test is a critical point; while not yet deemed seriously weakened, it requires regular close-up inspections to ensure the structural integrity of the chassis remains sound. A buyer should also verify the oil leak noted in 2025 to ensure it remains a minor seep and has not escalated into a significant mechanical failure.