2006 Audi A4 1.8L Petrol · BT06 WNX

A pattern of recurring suspension‑related advisories, wheel‑distortion notes and tyre‑cut warnings, punctuated by a major off‑side rear coil‑spring fracture in 2018 and a supplementary restraint system warning lamp fault recorded in the 2022 MOT, defines the mechanical story of this 2006 Audi A4. The latest test on 21 February 2022 returned a pass but also recorded a failure for the SRS warning lamp, meaning the vehicle left the test centre with an unresolved air‑bag system fault despite otherwise meeting the legal standards. At 115,702 mi the car averages just under 5,800 mi per year, a mileage level that is low for a twenty‑year‑old model. Such limited annual use can reduce wear on high‑stress components such as brakes and drivetrain bearings, yet age‑related degradation of rubber seals, bushings and corrosion‑prone areas may still be progressing beneath the surface. The MOT record shows consistent annual testing from 2017 onward, with no large mileage jumps between tests, suggesting the odometer reading is credible and that the vehicle has not experienced any sudden high‑usage periods that would accelerate wear. The recurring tyre‑cut advisories on both front and rear wheels and the repeated notes of slightly distorted rear wheels merit close visual inspection and a road‑test for wobble or vibration, especially at higher speeds. Examine the tyre sidewalls for any progression of the cuts and check tread depth across the full width; uneven wear could indicate underlying wheel‑runout or mis‑alignment. The suspension arm pin and bush wear advisories from 2021 suggest that the upper control‑arm bushings may be approaching the end of their service life – listen for clunking or knocking when traversing bumps and feel for any looseness in the steering feel. The off‑side rear coil‑spring fracture recorded in 2018 should have been rectified; verify that a replacement spring and any associated mounting hardware were fitted, and assess rear ride quality for any sag, excessive bounce or noise that would betray an incomplete repair. The fluid‑leak advisory appearing in several tests, though not classified as excessive coolant loss, indicates a minor leak that should be located and quantified – look for puddles under the engine bay after a short run and check coolant and oil levels for unexplained drops. The SRS warning lamp fault flagged in 2022 requires a diagnostic scan and likely component replacement before the air‑bag system can be relied upon; ensure the warning light is extinguished after any remedial work. Overall, a prospective buyer should focus the inspection on tyre condition, wheel run‑out, suspension bushings, rear spring integrity and the status of the air‑bag warning, confirming that all noted defects have been properly rectified before committing to purchase.