2004 Audi A4 1.9L Diesel · RA 5762

A consistent theme of corrosion-related advisories running through the rear of the vehicle, alongside a recent failed stop lamp, defines the mechanical story of this 2004 Audi A4. Across the recorded tests, the rear coil springs have been flagged as corroded on both sides in 2023 and again in 2024, the rear brake hoses have shown slight deterioration on both sides in 2023 progressing to ferrule corrosion on the front hoses by 2024, and the rear subframe itself was noted as corroded though not seriously weakened at the 2024 test. The most recent assessment on 30 September 2025 was a Pass, but only after a same-day failure on that date for a non-functioning nearside rear stop lamp and an ineffective rear wiper, with a further minor recorded for a deteriorated nearside front outer CV joint boot. The pattern suggests a chassis and braking system that are ageing in line with the vehicle's 22 years, rather than any sudden deterioration, but the cumulative effect of repeated advisories on the same components is worth weighing carefully. The recorded mileage of 75,370 miles over 22 years equates to an average of roughly 3,400 miles annually, which is low and points to a vehicle that has likely spent extended periods either stationary or used only for short journeys. Such usage can be a double-edged sword for a car of this age. Low annual mileage reduces wear on major drivetrain components, but it also means rubber, polymer, and under-sealed parts may have aged through disuse rather than use, with the 2025 CV boot deterioration being a plausible example of dry-rot on a seldom-stressed joint. Equally, irregular running can lead to condensation in the brake system, corrosion in the exhaust, and degradation of fluid lines, all of which would be consistent with the pattern of advisories recorded. For a prospective buyer, the priority areas for physical inspection are the rear coil springs and the rear subframe mounting points. Corroded coil springs on an Audi of this vintage are a known issue, and on a test drive you should listen for clonking or brittle noises over speed humps and uneven road surfaces, which would suggest the springs have begun to fracture. The subframe corrosion advisory should be examined with the vehicle on a ramp if possible, paying particular attention to the mounting brackets and any visible chassis rails adjacent to the rear suspension links. The brake hose corrosion advisories on the front and rear deserve close visual scrutiny too; look for weeping fluid, perished rubber sections, and any bulging under load when the pedal is pressed, as corroded ferrules can ultimately lead to hose failure under braking pressure. The front end and drivetrain should not be overlooked. The 2025 advisory on the nearside front outer CV boot, if not already replaced, will lead to grease loss and eventual joint failure, typically announced on test drive by a rhythmic clicking noise on full-lock turns, accompanied by any torsional vibration through the steering wheel. Given the failed stop lamp and ineffective rear wiper recorded on the same day as the 2025 pass, it is also worth confirming that both items have been properly rectified, and checking all rear light clusters, the wiper linkage for worn splines, and the general condition of the tailgate wiring where it passes into the body. With a vehicle of this age and profile, budgeting for replacement of the rear coil springs, both rear brake hoses, and the CV boot as imminent maintenance would be a realistic starting position before negotiating the purchase price.