2005 Audi A4 2.0L Diesel · L7 MCT

A pattern of recurring front brake and suspension advisories, alongside two separate Malfunction Indicator Lamp (MIL) failures, defines the roadworthiness profile of this 2005 Audi A4. The most recent test on 19 August 2025 produced an initial fail due to an inoperative MIL illuminating on the dashboard, with advisories logged for separating inner bushes on the offside front upper suspension arm and binding on the nearside front service brake. A retest on the same day then passed once the MIL issue was addressed, but the underlying advisories persisted, indicating components that were already on a trajectory of deterioration at the time of test. Looking back through the record, the front brake binding advisory has surfaced in some form at every annual test since 2022, progressing from a non-excessive advisory in 2022 and 2024 to a Major failure for excessive binding on the offside front in April 2022. The MIL has now illuminated twice in roughly three and a half years, while the upper arm bush separation noted in 2025 represents the first recorded instance of that specific defect. Annual mileage of approximately 6,341 miles over a 21-year life is broadly typical for the vehicle's age, though the recorded test history is notably uneven. There are large gaps between tests, with no recorded MOT activity between 2019 and 2022, and the 2022 and 2025 tests both fall within a few days of each other, suggesting possible late preparation for test or short gaps between failures and retests. The 2024 entry recorded a pass with rear brake disc wear and tyre edge wear advisories, alongside the brake binding items, which is consistent with a car that is being driven regularly enough to generate wear but with components that are not being replaced between tests. At 133,158 recorded miles, the consumables on a vehicle of this age and mileage typically include not just the items flagged but also drive belts, coolant hoses, and ageing engine mountings, even though those specific components have not yet appeared in the MOT record. For a prospective buyer, the front brake caliper mechanism is the single most pressing item to investigate physically, given that binding has been recorded on multiple occasions and on multiple wheels. On a test drive, listen for any dragging sensation when releasing the accelerator, uneven application of the brakes, or a pulling effect under braking that suggests a seized or partially seized caliper on one corner. The vehicle should be left to idle for a short period after a drive to feel whether any wheel remains noticeably hotter than the others, which is a classic symptom of a binding caliper. Given that the 2022 fail cited an offside front position lamp defect as a Major, the front lighting wiring and bulb holders on both sides should also be checked for corrosion and intermittent operation, particularly as these faults often recur on older vehicles. The offside front upper suspension arm inner bush separation flagged in August 2025 warrants a specific road test focused on the front end. With the bushes described as separating but with no movement recorded at test, a buyer should listen for clonking or knocking noises from the front suspension over speed humps, uneven road surfaces, and during full-lock manoeuvres at low speed. Any vagueness in the steering response, a wandering feeling at speed, or uneven front tyre wear across the axle would all suggest that the arm bushes have degraded further since the advisory was issued. Finally, because the MIL has illuminated twice in three years and on both occasions was addressed immediately prior to a retest, a diagnostic code read before purchase is strongly advisable to confirm the underlying emissions or engine management issue has been properly rectified rather than simply cleared, as intermittent MIL illumination on a high-mileage petrol engine of this age can be linked to lambda sensors, ignition components, or vacuum leaks that will not be visible during a standard road test.