2004 Audi A8 4.2L Petrol · YH04 ADU

The most recent MOT, carried out on 24 October 2024, resulted in a failure. While the vehicle passed the two preceding tests in January 2023 and January 2024, the emergence of several advisories and a major fault for the off‑side rear position lamp indicates a deterioration in condition rather than a stable or improving maintenance trend. The appearance of new items such as tyre perishing, a minor exhaust leak and wear on the lower suspension arm pin suggests that components are now reaching the end of their service life. At 123,166 miles recorded in 2026 the car averages roughly 5,600 miles per annum over its 22‑year life. This is considerably below the typical usage for a vehicle of this age and points to either light, intermittent driving or extended periods of inactivity. Low annual mileage can be a benefit in terms of reduced wear on engine internals, yet it also raises the likelihood of age‑related degradation: rubber seals and hoses become brittle, battery plates may sulphate, and steel components can develop corrosion when the car sits for long stretches. Any sudden increase in mileage after a period of storage would place additional stress on worn suspension bushings and brake hardware that may already be compromised. The front tyre advisories for slight damage, cracking or perishing demand immediate visual and tactile inspection. Examine the tread depth across the width of each tyre, look for any exposed cords, sidewall cracks or dry‑rot, and feel for hardening of the rubber. Even if the tread appears acceptable, the age of the tyres (likely well over ten years) means they may be nearing the end of their safe service life and should be replaced as a precaution. The minor exhaust leak should be traced for rusted joints or small cracks in the manifold or pipework; a leak can lead to elevated emissions, increased engine back‑pressure and a noticeable ticking or hissing sound at idle. The off‑side rear position lamp must be replaced, and the wiring harness inspected for corrosion or poor connections that could cause intermittent operation. Given the vehicle’s age and relatively low mileage, a thorough age‑related inspection is essential. Check the condition of the lower suspension arm bushings for excessive play or clunking when the car is driven over bumps, and verify that the coil springs are free of cracks. Inspect the brake discs and pads for surface rust, glazing or uneven wear, and test for any pulsation or shudder under braking. The battery should be load‑tested, and the electrolyte level examined if it is a conventional lead‑acid unit, as long periods of storage often lead to reduced capacity. Finally, confirm that all fluid reservoirs – engine oil, coolant, brake, and steering – have been refreshed within the recommended service intervals, and look for any signs of leaks, corrosion on the chassis, and the overall completeness of the service book. These checks will give a realistic picture of the car’s roadworthiness and the likely cost of bringing it back to a reliable condition.