2012 Audi A6 2.0L Diesel · KN12 PXF

This twelve-month-old A6 presents a mechanical story defined less by recorded defects and more by a peculiar pattern of retest activity clustered around its annual test windows. Both the 2024 and 2025 MOT cycles show a failure followed by a pass within roughly five to thirteen days, yet DVSA has not logged any specific reasons for the failures, meaning the presenting issues were either rectified off-screen or were categories not captured in the public record. The most recent pass on 22 October 2025 came with a clean sheet of advisories, which is the strongest objective evidence of roadworthiness currently on file. Overall the trend is stable rather than worsening, though the inability to see what triggered those two failures leaves a gap in the mechanical narrative that warrants physical scrutiny. At 90,569 miles over fourteen years, this A6 is averaging around 6,470 miles annually, sitting squarely within the expected band for a car of this age and class. There are no extended gaps in the testing history that would suggest the vehicle was laid up for any significant period, and the mileage progression between tests is consistent with regular rather than sporadic use. For a turbocharged Audi of this generation, that annual rate is gentle enough to spare the major drivetrain components from the accelerated wear seen on higher-mileage examples, but it is not so low as to raise concerns about dried seals, perished coolant hoses, or seized brake calipers from prolonged standing. The usage profile is, in short, unremarkable and should not present any unusual mechanical risk profile on that basis alone. Because the two recorded failures carry no specific defect data, the inspection priorities for a prospective buyer should focus on the components most commonly responsible for borderline MOT outcomes on a fourteen-year-old A6 of this mileage. Pay particular attention to the front and rear suspension assemblies, including the upper and lower wishbones, anti-roll bar drop links, and subframe mounting points, as these are known to deteriorate on the C7 platform and can produce clonking noises over speed humps or uneven tarmac. Inspect the brake discs and pads for lipping and uneven wear, and check that the caliper slide pins move freely, as binding calipers are a frequent reason for late MOT failures on cars of this vintage. Also examine the underside of the engine and gearbox for any signs of oil misting or weeping, particularly around the camshaft chain tensioner area and the rear crankshaft seal, and verify that the exhaust system including the rear silencer mounting rubbers is still securely supported, given the corrosion risk on a car now past its twelfth birthday. On the test drive, listen for any clonks or creaks from the front end when traversing speed bumps or pulling away from rest, as this would indicate worn suspension linkages. Feel for any pulling to one side under braking, which can suggest a binding caliper or a stuck brake flex hose, and watch for vibration through the steering wheel or brake pedal that points to disc runout rather than a wheel balance issue. Check the instrument cluster for any illuminated warnings, particularly the oil pressure light during cold start, and confirm that the automatic gearbox changes smoothly without hesitation or flaring between ratios. With no recorded advisories or defects to chase, the assessment of this A6 will hinge entirely on whether the suspension, braking, and underbody components show the typical wear commensurate with its age and mileage, rather than anything flagged on the official test record itself.