2017 Mercedes-Benz C 2.1L Diesel · YF67 AAY

The most recent DVSA examination on 5 November 2025 resulted in a failure, with a Major defect recorded against the offside front coil spring, which was found to be fractured or broken under section 5.3.1 (b) (i). At the same test, an advisory was issued for the offside rear tyre being worn close to the legal limit and on its edge. The vehicle subsequently passed, indicating that the fractured spring and any associated rectification work were completed to a satisfactory standard prior to re-test. Looking at the four-year MOT history, the trend is one of gradually accumulating advisories rather than outright failure, with a clean pass in 2023 and tyre advisories on all four corners in 2022, followed by a brake pad advisory in 2024, and then the more serious coil spring failure in 2025. This pattern suggests that suspension and undercarriage wear is becoming more pronounced as the vehicle ages, which is consistent with a chassis approaching the latter half of its expected service life. With a recorded mileage of 56,824 miles over nine years, this C-Class has averaged approximately 6,314 miles per year, which is broadly typical for a vehicle of its age and class. There are no significant gaps in the annual MOT pattern to suggest prolonged standing, nor is there any evidence of unusually rapid mileage accumulation that might indicate heavy use such as motorway commuting or fleet operation. At this annual rate, wear on major drivetrain components is likely to be moderate rather than severe, although the cumulative effect of nine winters of road salt and grit exposure will have taken its toll on underbody components, brake lines, and exhaust mounting points. A relatively steady usage profile generally supports good mechanical longevity, but it also means that age-related deterioration of rubber and composite components should not be overlooked. The fractured offside front coil spring recorded as a Major defect in 2025 is a notable item and warrants careful verification on any prospective purchase. Coil springs on Mercedes-Benz C-Class models of this generation are a known wear item, and once one spring fractures, the corresponding spring on the opposite side is often close to failure due to shared load characteristics. On a test drive, listen for a clonking or rattling noise from the front suspension, particularly over speed bumps, undulating surfaces, or when cornering, and observe whether the vehicle sits level at both front corners when parked on flat ground. It is also prudent to inspect both front springs physically for any signs of corrosion pitting or cracks, and to check that the replacement spring fitted is of correct specification and manufacturer. Uneven tyre wear on the front axle, or excessive bounce after pressing down on each front wing, can be further indicators of compromised suspension. Given the recurring advisories for tyres worn close to the legal limit and on their edges, prospective buyers should inspect all four tyres closely for uneven tread wear patterns, which on this model can indicate tracking misalignment, worn suspension bushes, or deteriorated anti-roll bar linkages. Edge wear in particular often points to suspension geometry being out of specification. Beyond the documented items, age-appropriate checks should include a thorough inspection of tyre sidewalls for perishing and cracking, which is common on vehicles kept outside or driven infrequently, even at moderate mileages. The 12V battery should be load tested, as Mercedes-Benz vehicles of this era are sensitive to voltage drop and can exhibit electrical gremlins with a marginal battery. Brake discs should be examined for corrosion around the outer edge and lip, and calipers should be checked for smooth operation and any evidence of binding. Finally, verify that brake fluid, coolant, and automatic transmission fluid have been changed on a calendar basis rather than purely mileage, as these time-sensitive services are frequently overlooked on cars of this vintage and can lead to internal corrosion of the cooling system and premature wear of transmission components.