2005 Audi A4 2.0L Diesel · SM55 HJJ

The 2005 Audi A4’s latest MOT test on 2026-09-01 was passed, though the history reveals a pattern of recurring issues that have not been fully resolved. While the vehicle has passed subsequent tests since 2021, the 2021 failure—marked by two major faults related to excessively binding rear service brakes—suggests unresolved mechanical wear or potential caliper or brake pad binding, which could indicate underlying hydraulic or mechanical issues in the braking system. The presence of multiple advisories, particularly concerning corrosion in the rear sub-frame and chassis, also points to long-term exposure to moisture or poor maintenance, which may have accelerated structural degradation over time. The fact that the vehicle has not failed again despite these persistent problems implies either effective corrective action or that the defects are either minor or mitigated by additional measures, but the buyer should remain vigilant. The recorded mileage of 153,263 miles over approximately 21 years represents a moderate annual usage rate of around 7,298 miles per year, which is typical for a vehicle of this age and class. However, the gap between the 2015 MOT and the 2016 failure—where the registration plate lamp was non-functional—suggests a period of inactivity or underuse, potentially leading to issues such as battery discharge or corrosion in electrical components. The subsequent tests show a return to stability, but the 2019 advisory about moisture around the fuel cooler pipes highlights a recurring underside concern that may warrant further investigation, particularly if the vehicle has been stored in damp conditions or driven through wet terrain frequently. The high mileage alone does not necessarily indicate excessive wear if the vehicle has been maintained, but the combination of mileage and historical MOT findings underscores the need for a thorough inspection of consumables, drivetrain components, and corrosion-prone areas. Given the MOT history, the buyer should prioritise a detailed inspection of the braking system, focusing on the rear calipers and brake pads for signs of binding or excessive wear. During a test drive, listen for uneven braking performance, shuddering, or grinding noises, particularly on the rear wheels, which could indicate binding calipers or warped discs. The advisories regarding corroded rear sub-frame and chassis suggest that the underside of the vehicle should be examined for rust progression, especially around the wheel arches, exhaust system, and suspension mounts. Check for fluid leaks under the vehicle, particularly around the brake hoses, which have been flagged for deterioration, and ensure no excessive vibration or clunking is present in the suspension, which could signal worn suspension bushes or coil springs. Additionally, the buyer should verify the condition of the front fog lamp and registration plate lamp, as these were repeatedly non-functional in previous MOTs. Inspect the tyre tread depth and sidewall condition, noting any signs of uneven wear or perishing, which could be exacerbated by the vehicle’s age and the presence of corrosion advisories. Given the vehicle’s age, the 12V battery should be tested for health, as prolonged inactivity or low demand cycles can lead to failure. Fluid levels—particularly brake fluid, coolant, and engine oil—should be checked, with a reminder that fluids degrade over time, even if the vehicle is driven regularly. Finally, verify that the service book contains all necessary stamps for scheduled maintenance, such as timing belt replacement, which for an Audi A4 is typically due around 100,000–120,000 miles, though this may vary by model variant. If the service history is incomplete, a pre-purchase inspection by a qualified mechanic is strongly recommended to address the persistent issues and ensure the vehicle’s roadworthiness and longevity.