2016 Mercedes-Benz A-Class 1.5L Diesel · KN66 FGO

Recurring exhaust emission failures and intermittent issues with consumables define the mechanical profile of this Mercedes-Benz A-Class. The vehicle has demonstrated a pattern of failing to meet emissions standards in 2023 and 2025, indicating a persistent issue with the engine's combustion efficiency or exhaust after-treatment system. While the most recent test on 20 August 2026 resulted in a pass, the record shows a history of multiple major failures regarding emissions, windscreen washer functionality, and lighting. The trend suggests a vehicle that requires periodic intervention to maintain compliance, particularly concerning the engine's ability to manage exhaust gases within specified limits. The recorded mileage of 78,367 miles over a ten-year period reflects an average annual usage of approximately 7,837 miles. This level of accumulation is consistent with typical light-to-moderate driving patterns for a vehicle of this age. Mechanically, this suggests that while the drivetrain and major engine components may not have been subjected to extreme high-mileage wear, the vehicle has likely experienced enough regular use to necessitate the replacement of wear-and-tear items such as tyres and bulbs, as evidenced by the various failures and advisories throughout its history. Prospective buyers should pay close attention to the exhaust and emission control systems given the repeated failures in recent years. During a test drive, it is advisable to monitor the engine's performance under load, listening for any unusual idling, hesitation during acceleration, or changes in exhaust note that might suggest the previous emissions issues have been fully rectified. Furthermore, the advisory from August 2026 regarding a slightly damaged or perishing offside front tyre, combined with previous advisories for sidewall cracking on the nearside rear, indicates a susceptibility to tyre degradation. You should inspect all tyres for sidewall cracking or cuts that reach the ply, and check for any uneven wear that could indicate suspension geometry issues. Specific attention must also be directed toward the braking system and fluid delivery. The 2024 MOT recorded a major advisory for a corroded offside rear brake pipe that was covered in grease or other material. This requires a physical inspection to ensure the corrosion has been addressed and that the pipe is structurally sound and free from leaks. Additionally, verify the functionality of the windscreen washer system, as this was flagged as a major failure in both 2024 and 2025. On a test drive, ensure the washer jets provide a consistent spray and that there are no signs of leaks from the reservoir or hoses, as this has been a recurring point of non-compliance for this vehicle.