2017 Mercedes-Benz C 2.1L Diesel · LL17 KOB

A single front suspension failure dominates the otherwise unblemished record of this Mercedes-Benz C-Class, with both nearside and offside lower suspension arm ball joints flagged as excessively worn at the May 2025 test, resulting in a Major failure that was subsequently rectified to enable a pass the following day. Aside from this incident, the vehicle has secured passes at every other recorded MOT since 2020, including clean tests with no advisories in 2021, 2022, 2023, and 2024, and most recently on 18 May 2026 with no defects recorded. The pattern suggests a generally well-resolved roadworthiness history interrupted by one significant suspension component wear event, though the simultaneous failure of both lower ball joints within a year of clean advisories-free passes indicates that wear on these particular items can develop rapidly even on a lightly used vehicle and warrants close inspection of the surrounding suspension geometry. With only 42,402 miles recorded over nine years, the annual accumulation works out at roughly 4,711 miles, which is well below average for a vehicle of this age. The mileage progression across tests remains consistent rather than showing large gaps or sudden jumps, indicating the car has been in regular use rather than laid up for extended periods, which reduces the typical risks associated with long-term stationary storage such as seized brakes, deteriorated rubber components, or flat-spotted tyres. That said, the low annual mileage means brake discs and pads may have suffered from corrosion through infrequent use rather than wear from sustained braking, and tyres will still perish through age regardless of tread depth. Given that both front lower suspension arm ball joints were replaced following the May 2025 failure, particular attention should be paid to the surrounding front suspension on any test drive. Listen for clonking or knocking noises from the front end over speed bumps, uneven road surfaces, and during full-lock low-speed manoeuvres, as a knock from the new or adjacent bushes could indicate that the underlying cause of the rapid joint wear has not been fully addressed. Feel for any vagueness or wandering in the steering, particularly over undulating surfaces, and check for uneven inner or outer tyre wear on the fronts, which can point to misalignment or worn geometry components not directly inspected during the MOT. The rear tyre perishing advisories noted in 2025 should not be dismissed, as cracking rubber is more a function of age than mileage, and both rear tyres being flagged simultaneously suggests either age-related deterioration or prolonged exposure to UV. On inspection, examine all four tyres closely for sidewall cracking, checking particularly between the tread grooves, and verify the DOT date codes to ensure they are not approaching the recommended replacement age regardless of remaining tread. During the test drive, apply the brakes firmly from a moderate speed to check for any judder or vibration through the steering wheel, which on a low-mileage vehicle may indicate corroded rather than worn front discs, and listen for any binding or scraping sounds from the rear calipers when setting off cold, as this is a common issue on lightly driven cars where the rear mechanism seizes slightly from disuse.