2017 Audi A6 2.0L Diesel · GD17 YUS

A 2017 Audi A6 presenting with a fundamentally clean MOT history has, on its most recent assessment dated 8 January 2026, produced its first genuine mechanical concerns in the form of multiple Major defects at the same test. The failure items are significant but isolated rather than indicative of chronic structural deterioration: a split nearside windscreen wiper, an inoperative engine management warning lamp, and a split offside front outer CV joint boot that has reached the stage where it can no longer prevent dirt ingress. The advisory record from earlier tests is sparse and benign, limited to a child seat preventing adult belt inspection in December 2023 and front brake pads noted as wearing thin alongside a superficial nearside front tyre cut in November 2022. There is no pattern of repeated suspension, corrosion, or brake line advisories across the recorded tests, suggesting the bulk of the car remains structurally and mechanically sound. The sudden appearance of multiple Majors at the most recent test does, however, warrant close attention to confirm that all identified items have been rectified to a satisfactory standard. Mileage accumulation of 99,612 miles across nine years equates to an average of approximately 11,068 miles annually, which sits squarely within the expected band for a vehicle of this age and type, neither suggesting excessive motorway mileage nor prolonged periods of standing unused. The testing cadence has been consistent, with annual entries spanning 2022 through to 2026 and no extended gaps that would point to an off-road period during which deterioration of components such as brake discs, tyres, or underbody rubber seals could have advanced unchecked. The relatively even progression of annual mileage supports a usage profile of regular mixed driving, which for an Audi A6 of this generation typically means the drivetrain, dual-clutch or torque converter automatic, and turbocharged engine internals will have been kept in reasonable working order through normal thermal cycling. There is no evidence in the record of a sudden mileage spike or an odometer anomaly that would require further investigation. For a prospective buyer, the immediate priority is to confirm the rectification and quality of the three Major failure items from January 2026. The split offside front CV joint boot is the most mechanically significant, as prolonged operation with a torn boot allows water and grit to contaminate the constant velocity joint grease, leading to accelerated wear of the internal bearings and eventual knocking or clicking under full lock at low speed. On a test drive, listen for any rhythmic clicking from the offside front when turning sharply into a kerb, and inspect the inside of the wheel for fresh grease splatter indicating a recent replacement. The engine management warning lamp inoperative fault should be verified by confirming the MIL illuminates with ignition and extinguishes once the engine is running, and that no fault codes remain stored; an illuminated or absent lamp can mask emissions faults or sensor failures elsewhere in the system. The wiper blade condition should be checked visually for even contact across the screen, particularly on the offside where the original failure was recorded. Given the November 2022 advisory for front brake pads wearing thin, it is entirely reasonable to expect that the pads and possibly the discs have since been replaced, but this should be confirmed by direct inspection of pad thickness and disc condition. On a road test, the brake pedal should feel firm without excessive travel, and there should be no judder through the steering wheel under medium to heavy braking which would suggest disc runout or uneven wear. The nearside front tyre should be examined for any signs of a repaired cut or bulging sidewall, as cuts of that nature can develop into more serious failures over time. With no corrosion, suspension, or exhaust advisories on file, the bulk of the vehicle's structure is likely in good order, but given the 99,000-mile accumulation, a thorough inspection of the front and rear suspension bushes, anti-roll bar drop links, and top mount bearings is advisable, listening for any clonks or creaks over uneven surfaces. A full underbody examination for any fresh oil leaks from the engine or automatic transmission, together with a diagnostic scan to confirm no stored powertrain fault codes, would round off a sensible pre-purchase evaluation of this A6.