2018 Mercedes-Benz A-Class 1.5L Diesel · SD18 DPY

A pattern of intermittent but distinct mechanical faults has defined the MOT history of this 2018 Mercedes-Benz A-Class, with three failures recorded across the eight tests documented to date. The most recent test on 3 September 2026 returned a clean pass with no defects or advisories noted, continuing an improving trajectory after the fractured offside rear coil spring recorded as a major failure at the 2025 retest. Prior to that, the 2024 test cycle identified effective front wiper function and washer fluid delivery failures alongside a rear washer blockage advisory. The fracture of a coil spring is a significant structural and safety concern, as a broken spring can lead to sudden tyre contact with the bodywork or compromised handling. While the vehicle subsequently passed, the buyer should approach the rear suspension geometry with informed scepticism, as a single broken spring often points to general coil fatigue or uneven loading that may affect the nearside unit next. With 77,943 miles accumulated over approximately eight years, this A-Class is running at roughly 9,743 miles per year, which sits close to the expected average for its age and avoids any red flags associated with very low annual mileage or extended periods of standing. There are no unusual gaps in the testing record, and the mileage progression between annual tests appears consistent with regular use, which generally supports steady wear on consumables rather than the dry-rot or fluid degradation risks associated with low-mileage vehicles. This level of use means that standard wear items such as brake pads, discs, tyres, and suspension components will have been subjected to normal service intervals and are likely approaching or due for replacement based on mileage rather than calendar age. The 2022 advisory noting front brake disc wear on both sides, combined with the recurring inner-edge tyre wear advisories on both front and rear axles from 2021 and 2022, points to a potential tracking or camber issue that should not be dismissed. Uneven inner-edge wear that appears on multiple tyres across consecutive tests is often a symptom of incorrect wheel alignment, worn suspension bushes, or bent components in the front and rear suspension linkages. A prospective buyer should carry out a test drive specifically listening for clonking or knocking noises from the front suspension over uneven surfaces, particularly on speed bumps, and observe whether the steering pulls to either side under acceleration or braking. It is also worth inspecting all four tyres for stepped or feathering on the inner edges and checking the date stamps on the sidewalls to ensure replacements are recent. Given the fractured rear coil spring failure in 2025, the rear suspension should be examined carefully for any sagging, noise, or loss of ride height, particularly on the offside where the failure occurred. During a test drive, pay attention to any harshness, bottoming out, or uneven ride quality that might suggest the replacement spring was fitted without addressing an underlying cause such as a weakened spring perch or mismatched components. The earlier wiper and washer failures are relatively minor and likely resolved, but it is prudent to verify full washer jet operation and effective wiper clearing across the entire swept area before purchase. Finally, inspect the underbody, subframe, and brake pipes for any corrosion, as the Mercedes-Benz A-Class of this generation is known to develop surface rust on underbody components, and ensure there are no oil leaks from the engine or transmission that could indicate ageing seals.