2002 Audi A6 4.2L Petrol · S666 AAF

The most recent MOT test on 2025-08-22 resulted in a clean pass, indicating that the vehicle has now returned to compliance with roadworthiness standards after previous failures. However, the MOT history reveals a pattern of recurring issues, particularly related to the exhaust system and suspension, which suggest that the car has not been fully maintained to address underlying problems. The repeated failures in 2023 and 2024—particularly the persistent exhaust lambda sensor readings outside specifications—highlight a fundamental fault in the engine management system, likely stemming from a faulty sensor, wiring, or emissions control component. The nearside and offside front tyre wear advisories from 2025-07-11, along with the rear tyre edge wear from 2023, indicate uneven tyre loading and potential suspension or alignment issues that have not been rectified. The slight play in the offside front lower suspension arm ball joint from 2023 suggests ongoing wear in this critical component, which could lead to further misalignment, steering anomalies, or even suspension failure if ignored. The vehicle’s recorded mileage of 146,840 miles at 24 years old represents a moderate annual usage rate of approximately 6,118 miles per year, which is typical for a car of this age and usage profile. Lower mileage might suggest periods of inactivity or lighter use, potentially leading to issues such as fluid degradation from standing, corrosion from lack of movement, or wear from infrequent driving. Conversely, higher mileage could accelerate wear on consumables like brake pads, suspension components, and tyres, but the current mileage does not indicate rapid or excessive usage. The gaps between MOT tests—particularly the two-year interval between 2023 and 2025—could also imply that the owner has not been proactive in addressing maintenance, which may have allowed minor issues to escalate into major failures. This pattern is concerning, as it suggests that the vehicle may have been driven with suboptimal care, potentially leading to more severe mechanical stress over time. For a prospective buyer, the most critical areas to inspect are the exhaust system and emissions components, as the repeated MOT failures indicate a persistent issue that could lead to further engine performance degradation or even failure if not resolved. Test for leaks or unusual noises from the exhaust manifold, catalytic converter, or exhaust pipes, and verify that the engine’s idle and acceleration response are smooth, without excessive smoke or hesitation. The suspension advisories, particularly the ball joint play, warrant immediate attention. On a test drive, listen for clunks or rattles from the front suspension, especially when cornering or over bumps, and check for uneven tyre wear patterns that may indicate misalignment or suspension misalignment. The tyres should be inspected for sidewall cracking or perishing, which is common in older vehicles due to prolonged exposure to UV radiation and temperature fluctuations. Additionally, verify that the tyres meet the legal minimum tread depth and that the offside rear tyres, which were close to the legal limit, have not worn further. Beyond the mechanical checks, the buyer should also assess the vehicle’s standing condition, as prolonged inactivity can cause fluid degradation and corrosion. Check the engine bay and undercarriage for signs of rust, particularly around the wheel arches, exhaust pipes, and suspension components, which are common areas for moisture ingress. Inspect the 12V battery and associated wiring for corrosion or poor connections, as older vehicles are more susceptible to battery failure from standing. The brake system should be evaluated for signs of corrosion on discs or binding calipers, which can occur when the vehicle stands for extended periods without use. Finally, since the vehicle’s age and mileage are relatively high, it is advisable to verify the presence of any service book stamps or maintenance records, particularly for fluid servicing (oil, coolant, brake fluid) and timing belt replacement if applicable. Given the history of exhaust-related failures, a professional diagnostic check of the engine management system and emissions components would be prudent before proceeding with purchase.