2021 Audi A6 S Line 40 TDI Mhev S-A 2.0L Diesel · K9 TYB

The 2021 Audi A6 S Line 40 TDI MHEV has maintained a clean MOT history with no defects or advisories recorded in either of the two most recent tests, most recently passing on 2025-10-21 at 35,673 miles. This indicates a stable roadworthiness trend over the past year, with no evidence of recurring mechanical failures or unresolved issues. The absence of advisories suggests the vehicle has undergone regular servicing aligned with manufacturer schedules, though the lack of service records means critical fluid changes and component replacements cannot be confirmed. The most recent test was conducted just over nine months ago, which is within the standard MOT validity period but nears the point where wear items like brake pads, tyres, and suspension bushes would benefit from renewed inspection. The recorded mileage progression of 30,177 miles in November 2024 to 35,673 miles in October 2025 reflects a consistent annual average of approximately 5,496 miles, slightly below the previously noted 7,135 miles per year. This suggests the vehicle has not been subjected to excessive wear from high mileage, though it also implies periods of inactivity or lower usage. The gap between tests—approximately 11 months—is standard, but the lack of intermediate mileage data means there is no way to verify whether the vehicle was stored or driven irregularly during that time. For a vehicle of this age, the mileage remains reasonable, though the absence of any MOT advisories does not preclude the need for proactive checks on less obvious components. Given the clean MOT history, a buyer should prioritise an independent inspection of the braking system , particularly the rear calipers and discs, as TDI models are prone to binding or corrosion-related issues. The suspension —including coil springs, bushes, and dampers—should be examined for uneven wear or leaks, as these are critical for handling and safety. Exhaust emissions warrant attention, as the MHEV hybrid system may have unique diagnostics; any recent modifications or error codes should be clarified. Structural corrosion should be checked at wheel arches, sills, and underbody, especially given the vehicle’s age and exposure history. While the MOT record provides reassurance, the absence of service documentation means fluid levels (coolant, brake fluid, differential oil) and filter replacements cannot be confirmed, which could impact long-term reliability.