2010 Audi A6 2.0L Diesel · SD10 AEF

The dominant mechanical theme across this A6's MOT history is the gradual emergence of underbody corrosion on a vehicle that is now sixteen years old, accompanied by a recurring cluster of minor electrical and glazing issues that have surfaced repeatedly over several test cycles. The most recent assessment on 21 February 2026 was a clean pass with no advisories, but that result must be read in the context of the prior year's failures and advisories rather than in isolation. In March 2025 the vehicle failed on a major exhaust leak at the joining sleeve, and although it subsequently passed that same day, the examiner recorded advisories on both rear lower suspension arms showing corrosion plus corrosion on the rear subframe. None of those advisories were repeated in the 2026 test, which could indicate either that remedial work was carried out between tests or, more cautiously, that surface corrosion at subframe level can progress between annual examinations without the examiner being obliged to flag it again unless it becomes seriously weakened. Tyre condition has also been a recurring concern, with major cuts deep enough to reach the ply or cords recorded on three tyres in 2024 and a single front tyre in 2021, suggesting that inner-sidewall damage and perishing have been a chronic pattern rather than an isolated event. The recorded mileage of 128,105 miles across approximately sixteen years equates to an annual accumulation of roughly 8,000 miles, which is broadly consistent with regular commuter use. There are no extended gaps in the testing history that would suggest the vehicle has been laid up for prolonged periods, and the tests appear at fairly regular intervals of one to fifteen months, indicating continuous road use throughout the recorded period. This kind of steady mileage is mechanically neutral in isolation, but it does mean that consumables such as brake discs, pads, suspension bushes, and coil springs will have accumulated wear broadly in line with the vehicle's age, while the higher-mileage components such as the dual-clutch automatic gearbox, turbocharger, and engine ancillaries should be regarded as having covered a substantial working life. The advisory in March 2024 noting that the brake pad warning light was illuminated is worth particular attention, as it indicates that pads had worn to their service limit on at least one axle during the recorded period and that the warning system had activated, which on Audi vehicles typically corresponds to sensor wire depletion rather than a sensor fault. For a prospective buyer, the priority inspection areas are the rear underbody structure and the rear suspension components flagged in the 2025 advisories. On a ramp inspection or by feel through the wheel arch liners, the rear subframe mounting points and the rear lower suspension arms should be checked for advanced surface rust, flaking, or any visible distortion, paying close attention to the inner faces of the arms where corrosion can be hidden from a casual glance. On the road, listen for clonking or knocking noises from the rear suspension over uneven surfaces, particularly on direction changes, as corroded arm bushes or ball joints can introduce slack that only manifests under load. The front suspension should similarly be exercised over speed humps and broken tarmac to detect any wear in the front control arms, anti-roll bar links, or top mounts, which are common wear items on a vehicle of this age and mileage but were not specifically flagged in the MOT record. The braking system warrants a firm pedal test from speed to check for judder or pull, and a check of the rear light clusters for the lens hazing noted in 2024 should be carried out, as deteriorated lenses can allow moisture ingress and corrode bulb holders and wiring. Finally, the exhaust system should be examined on a cold start for any ticking or blowing noises from the central joint area, and a careful check should be made for any blue or black smoke on start-up which could indicate turbo or valve seal wear given the mileage accrued.