2021 Mercedes-Benz C 1.9L Diesel · L112 FOX

A pattern of progressive consumable wear has emerged at the most recent test on 4 March 2026, with five advisories recorded across tyres and rear brake pads despite an overall pass. While the 2024 and 2025 tests returned clean sheets with no advisories, this sudden cluster of wear-related items after consecutive trouble-free assessments suggests a vehicle that is either reaching the natural end of its first set of brake and tyre consumables or has been subjected to a change in usage pattern. The advisories are not failures and do not compromise roadworthiness today, but they do indicate that replacement of all four tyres and the rear brake pads is now due, with particular attention needed to the nearside rear inner pad and both inner edges of the rear tyres. Recorded mileage stands at 28,515 miles over five years, equating to approximately 5,703 miles per year, which is notably low for a vehicle of this type. The MOT history shows no testing gaps and a broadly steady, modest accumulation between annual tests, suggesting the car has been in regular but light use rather than left standing for prolonged periods. Mechanically, lower annual mileage typically means less wear on major drivetrain components, clutches, and high-mileage service items, but it can also allow surface corrosion on brake discs, deterioration of rubber components such as bushes and seals, and moisture-related issues in fluids and undertrays. The absence of any structural corrosion advisories across three tests is a positive indicator for a modern Mercedes-Benz, though this is consistent with a well-maintained low-mileage example rather than exceptional durability. For a prospective buyer, the immediate priority is a close physical inspection of the four tyres, particularly the nearside and offside rear inner edges, as edge wear on rear tyres is often symptomatic of either incorrect tracking, suspension geometry wear, or prolonged kerbing. On a test drive, pay particular attention to any pulling to one side under braking or during steady motorway cruising, any clonking or knocking from the front suspension over uneven surfaces, and any vibration through the steering wheel that could indicate a slightly buckled wheel or uneven tyre wear. The rear brake pads should be inspected for remaining thickness, and the rear brake discs examined for lipping or corrosion, especially given the low-mileage usage where discs may have developed surface rust that has not been cleaned away by regular braking. Beyond the advisories, it is worth listening for any signs of rear brake caliper binding, as low-mileage cars can suffer from seized caliper mechanisms that drag and cause uneven pad wear, which would explain the simultaneous wear on both inner rear pads. Check that the rear wheels rotate freely by hand when cold and that there is no residual heat on one side after a short drive. The low annual mileage also warrants a thorough check of fluid conditions, including brake fluid colour and clarity, coolant age, and the condition of the battery, particularly if the vehicle has been used predominantly for short journeys. Finally, confirm the service history and ensure that all four tyres have been replaced or budget for imminent replacement, as the recorded edge wear on the rears at 2.5 mm tread depth leaves no usable life remaining.