2020 Mercedes-Benz C 1.9L Diesel · ST54 OKS

The June 2025 test at 36,527 miles returned a clean pass, yet the record shows a failure just eight days earlier at 36,475 miles with no defects logged for either event. That sequence points to a rectified fault the tester deemed serious enough to fail the car, then signed off after repair. The absence of any advisory items across four consecutive tests is unusual for a six-year-old Mercedes and suggests either meticulous preparation or incomplete recording. Annual mileage has climbed from roughly 7,500 miles between July 2023 and June 2024 to over 8,500 miles in the latest twelve-month window. The jump from 20,526 to 28,012 miles, then to 36,527 miles, shows the car moving from light use into more regular daily service. No prolonged lay-ups appear in the timeline; each test falls roughly twelve months apart. A buyer should treat the unrecorded June 2025 failure as a priority investigation. Ask for the original failure sheet or garage invoice to identify whether the issue involved braking, suspension, emissions or structural corrosion. With no advisories on brake discs, pads, tyres or suspension bushes across the history, inspect those consumables closely — low-mileage cars often hide seized calipers, perished rubber or aged brake fluid that only reveal themselves under load. Verify the service book matches the rising mileage trend; a gap in dealer stamps would weaken confidence in the clean MOT run. Check the underbody for corrosion on brake lines, fuel pipes and subframe mounts, areas the tester may have passed but which merit a ramp inspection. The current certificate expires June 2026, so a fresh test is imminent — use that as leverage to demand a full pre-purchase inspection before committing.