2016 Mercedes-Benz A-Class 1.5L Diesel · WF66 EVW

The latest MOT test on 2026-06-09 returned a pass, but it included two persistent advisories regarding the rear coil springs, both of which have been flagged as corroded in the previous two annual tests. This pattern indicates a recurring structural issue that has not been rectified, suggesting either inadequate maintenance or underlying material fatigue. While the vehicle has otherwise passed all prior MOTs without defects, the repeated corrosion advisories on the coil springs—particularly both sides—demonstrate a significant and unresolved problem that warrants immediate attention. The advisories under the under tray at the test also suggest potential hidden mechanical or fluid-related concerns, though these are not directly linked to the coil spring failures. The recorded mileage of 122,278 miles for a vehicle aged approximately ten years represents an exceptionally high annual usage rate of around 12,228 miles per year, which is far above the average for its class. Such rapid mileage accumulation accelerates wear on critical components like brakes, suspension, and drivetrain elements, increasing the likelihood of premature failure or component fatigue. The absence of significant mileage gaps—particularly over the past six years—implies consistent, heavy usage, which may have contributed to the observed corrosion in the coil springs and potential thinning of brake pads. This pattern also raises concerns about fluid degradation, such as brake fluid absorption of moisture or coolant system stress from thermal cycling, though no such issues have been flagged in the MOT records. Given the recurring corrosion advisories on the rear coil springs, the prospective buyer should conduct a thorough inspection of the suspension system, focusing on the rear coil springs for signs of further deterioration, such as rust through the metal or structural weakening. During a test drive, listen for unusual suspension noises, particularly clunks or rattles when the vehicle is driven over bumps or at low speeds, which may indicate loose or failing suspension components. The binding calipers or warped brake discs could also be contributing to the thin brake pads noted in the 2021 MOT, so checking for brake shudder, uneven tyre wear, or a spongy pedal feel is essential. If the coil springs are confirmed to be beyond repair, replacement may be necessary, and the buyer should budget for this cost, as the current advisories suggest the springs are nearing the end of their serviceable life. For the buyer, the next critical steps include verifying the service history for the suspension and brake systems, ensuring that all fluid levels—particularly brake fluid, coolant, and differential oil—are up to date and free from contamination. Given the high mileage and the potential for fluid degradation over time, a professional fluid flush may be advisable, especially for the brake system, which is prone to moisture absorption. Additionally, the buyer should inspect the tyres for signs of sidewall cracking or perishing, which can occur even at lower mileages due to prolonged exposure to UV light and temperature fluctuations. A 12V battery health check is also prudent, as prolonged idling or heavy usage can accelerate battery wear. Lastly, if the vehicle has been stored for extended periods, internal corrosion from standing fluid or rust from exposed metal parts should be addressed, particularly in the wheel arches, exhaust system, and under-tray areas. A comprehensive pre-purchase inspection by a qualified mechanic would be the most reliable way to assess the full extent of the coil spring corrosion and other potential hidden issues.