2009 Audi A4 2.0L Diesel · ML09 MME

The vehicle most recently passed its MOT on 21 August 2025 following a fail two days earlier, with the current pass carrying several minor items and advisories that warrant attention. The historical pattern over the past four years reveals a consistent and worsening trend of mechanical degradation rather than a stable maintenance profile. Recurring split constant velocity boots on the front drive shafts have appeared in 2022, 2023, 2024 and 2025, suggesting either repeated ingress of contamination or inferior replacement components being fitted. More concerning is the 2024 dangerous failure for rear brake pads below 1.5 mm combined with a leaking rear shock absorber, and the 2022 advisory on that same shock which now progressed to a serious fluid leak, indicating components fitted as advisories are not being addressed proactively. The engine management light malfunction recorded in August 2025, alongside the rear brake near-failure, points to deferred maintenance, while the 2023 lighting and headlamp aim failures indicate electrical and adjustment neglect. Overall, the trajectory suggests the vehicle has not received the preventative care commensurate with its age and mileage, and the passing test should be viewed in the context of a steady downward maintenance pattern. With 228,875 miles recorded against a 17-year platform, this Audi has averaged approximately 13,463 miles annually, which is considerably higher than typical private use and consistent with extensive motorway or fleet-style driving. There are no significant standing periods evidenced by the MOT frequency, meaning wear-related components such as the clutch, turbocharger internals, timing chain tensioner, dual mass flywheel and automatic transmission torque converter will have accumulated substantial fatigue cycles. High annual mileage on a turbocharged petrol or diesel Audi of this generation places additional stress on the crankcase breathers, oil control rings and injectors, so buyers should expect the engine to have absorbed considerable thermal cycling. The MOT history also shows the under trays were noted as insecure, which can mask oil leaks from above and conceal the true condition of the sump, oil filter housing and turbo line connections during informal inspection. Given the recurring CV boot failures across all four recent tests, the front drive shafts and joints themselves may now be on borrowed time and a prospective buyer should listen for clicking or knocking from the front when turning at full lock, particularly on a cold start or under load. Vibration through the steering or a humming that varies with speed suggests the joints have already suffered contamination and will require complete shaft replacement rather than a simple boot kit. The ball joint dust cover deterioration noted in 2023 and again in 2025 on the offside front indicates the joint is being exposed to grit and moisture, accelerating wear of the taper itself; clunks over bumps or during braking, vague steering, or uneven inner-edge tyre wear would suggest the joint has worn past acceptable tolerance. The track rod end failure in 2022 and upper suspension arm bush wear that progressed from advisory in 2022 to persistent front-end concerns is a classic high-mileage Audi A4 pattern, where the front subframe bushings, anti-roll bar drop links and control arm rear bushes harden, crack and deform, leading to imprecise steering and wandering at speed. The braking system also demands close scrutiny, with rear pads reaching dangerous thickness in 2024 and rear brake disc condition unverified since. The vehicle should be road-tested for any pulling to one side, a soft or spongy pedal, or brake shudder under hard stopping which would indicate warped rear discs given the high mileage. The rear shock absorber leaking oil is a confirmed structural and safety concern that will compromise handling and tyre wear across the rear axle, while the engine management light being inoperative is particularly worrying as it means any current emissions or misfire fault would be invisible to the driver. Additionally, at this age and mileage, even items not flagged on MOT should be physically inspected, including the timing chain or cam belt interval verification, the condition of the coolant and radiator plastic components which become brittle, the condition of the automatic transmission fluid if automatic, and the 12V battery which often fails without warning on high-mileage vehicles. The tyres should also be checked for age-related perishing on the sidewalls regardless of tread depth, given the high mileage and likelihood of replacements being budget items, and a compression or leak-down test on each cylinder would be prudent given the engine management warning history and potential for internal wear or valve stem seal oil consumption that develops on these engines at this mileage threshold.