2004 Audi A4 1.9L Diesel · FG04 PRZ

The defining mechanical narrative of this 2004 Audi A4 is a recurring pattern of front suspension wear that has escalated from advisories into outright test failures, compounded by a persistent oil leak that has appeared at every recorded test since at least 2020. The most recent examination on 2024-10-24 ended in a failure, driven by ineffective wiper operation, headlamp aim being too low alongside damaged offside front cowlings, and advisories noting a strong oil leak, an exhaust gas leak at the front, and an intercooler leak. Front upper suspension arm pin or bush wear was first noted as an advisory in 2019, recurred in 2020 and 2021, and by October 2022 had deteriorated to a major failure on both nearside and offside sides, requiring replacement to clear the test. Although subsequent tests in 2023 passed, slight play was again recorded at the nearside upper arm ball joint, indicating the replacement components are themselves beginning to show movement. Across the six years of recorded history, the vehicle has visited the test station ten times with two failures and eight recorded advisories or worse on suspension components, suggesting the front suspension geometry has been a chronic area of attention. At 145,147 miles over twenty-two years, the average annual mileage is approximately 6,598 miles, which is broadly typical for a vehicle of this age and consistent with the regular annual testing cadence shown in the records, with no extended lay-up periods evident. The mileage progression between tests suggests steady, moderate use rather than rapid accumulation, which on a 1.8T or similar small-capacity Audi engine of this era generally implies that major drivetrain internals have been worked but not excessively abused. However, the consistent inner-edge tyre wear noted across multiple front tyres in 2021, combined with the chronic suspension arm bush deterioration, points towards alignment geometry that has been out of specification for some time, a factor that accelerates wear on related components regardless of annual mileage. The minor CV joint boot deterioration recorded on the offside front drive shaft in 2023 is also consistent with the vehicle's age and mileage and warrants prompt attention before the joint itself is compromised by loss of lubrication. For any prospective buyer, the priority inspection items are the front upper suspension arms and their inner bushes, as these have been the single most consistent defect across the entire MOT history and were replaced only once, in late 2022. On a test drive, listen for clonking or knocking noises from the front suspension over uneven roads, particularly over speed humps and potholes, and feel for vagueness or imprecise steering response, especially around the straight-ahead position. Inner-edge tyre wear is a direct symptom of suspension geometry misalignment or worn bushes, so the front tyres should be inspected for uneven shoulder wear and the camber checked professionally. The persistent oil leak advisories, classed as not excessive each time, suggest a steady seep rather than a gush, but the buyer should inspect the engine and underside for fresh oil residue and ask when the oil and filter were last changed, as prolonged leaks can mask consumption issues. The intercooler and front exhaust leaks noted in 2024 should be investigated by listening for a hissing or ticking sound from the engine bay under load and checking for soot around turbo pipe joints. Brake condition has been a secondary but recurring theme, with rear disc pitting and scoring noted in 2021 and front disc lipping in the same test, so a thorough brake inspection should include measurement of remaining disc thickness and pad life. On the road, the buyer should test the brakes from higher speeds, feeling for pedal judder, pulling to one side, or any grinding sensation that might indicate warped or excessively worn discs. The headlamp aim failure and damaged offside front cowling from the 2024 test should be verified as rectified, as misaligned headlamps will result in an immediate retest failure. Given the vehicle's age, a structural inspection for corrosion around the wheel arches, sills, and subframe mounting points is strongly recommended, as MOT records only flag corrosion visible from beneath, and an undertray removal may be necessary for a complete assessment. Finally, the CV boot deterioration on the offside front should be visually checked for splits and grease loss, as failure to address this will lead to complete drive shaft replacement at substantially greater cost.