2012 Audi A4 2.0L Diesel · SW62 AAK

A 2012 Audi A4 of this age carrying a recorded rear subframe corrosion failure and a repeat split outer CV boot defect presents a notably elevated structural and drivetrain risk that any buyer must weigh carefully before purchase. The 2025-12-11 pass at 132,829 miles cleared the vehicle for road use, but that single green result follows an immediate prior day failure for a split offside front outer CV boot which had migrated from an advisory on the same test to a major failure on the retest, and an earlier November 2025 failure which identified the seriously weakened rear subframe. The trajectory across 2025 is unambiguously worsening, with two failures recorded inside a six week window, both accompanied by multiple tyre edge wear advisories spanning three corners of the car. While the 2023 and 2024 tests passed cleanly aside from minor advisories, the most recent record shows the mechanical condition deteriorating rapidly into its second half of life, and the subframe finding in particular is not a routine advisory item but a structural integrity concern recorded under section 5.3.3 (b) (i). Against a typical lifespan of fourteen years, the recorded 132,829 miles equates to roughly 9,488 miles annually, which sits broadly in line with average usage for the cohort. There are no significant gaps between annual tests across 2023, 2024 and 2025, indicating the vehicle has remained in continuous use rather than being laid up, and the mileage accumulation appears steady rather than subject to any sharp spikes that would suggest a long motorway commute or commercial use. The consistent annual testing pattern means the recorded defects are a fair reflection of wear progression on a car that has been driven regularly, and the subframe corrosion finding is particularly relevant on a fourteen year old Audi given the known susceptibility of the rear subframe and adjacent suspension mounting areas on this generation to advanced oxidation once the factory underseal degrades. The specific components flagged in the test history warrant close physical inspection and a targeted test drive. The 2024 advisories on both front lower suspension arm rear bush pins indicate wear that was not yet excessive enough to fail but should be monitored for progression, and on the road any clonking or knocking over uneven surfaces, vague steering through high-speed bends, or uneven tyre wear returning quickly after a geometry check would suggest the bushes have deteriorated further. The split outer CV boot on the offside front drive shaft recorded as a major failure is critical because once grease escapes and moisture ingresses, accelerated joint wear follows; with the vehicle warm and stationary, a sharp turn to full lock while listening for a rhythmic clicking or a crunching sensation under load will expose a worn joint. The 2024 advisory on the offside front brake hose ferrule corrosion is also worth a visual check of all four flexible brake hoses for surface rust, blistering under load, or any spongy pedal feel on the test drive that could indicate internal hose degradation. The rear subframe corrosion finding from November 2025 is the single most concerning entry and should be physically examined by placing the vehicle on a ramp to assess the extent of section loss around the mounting points, trailing arms and any adjacent chassis legs, as MOT criteria permit failure only when corrosion has seriously weakened the component, meaning visible perforation or significant flaking is likely already present. The repeated tyre edge wear advisories across three tests in 2025 also warrant scrutiny of the wheel alignment geometry and a check for bent or fatigued suspension components, as inner or outer edge wear on multiple tyres typically points to inconsistent camber settings rather than simple inflation issues. Finally, given the mileage and age, an inspection for oil seepage from the turbo, valve cover gasket and cam chain area should be performed, alongside a check of the cooling system and automatic gearbox oil condition if applicable, as these are common high-mileage failure points on the A4 that have not yet surfaced in the MOT record but would be expected to be approaching attention.