2015 Audi TT 2.0L Petrol · PD52 BAX

An emerging emissions concern sits at the centre of this Audi TT's MOT history, with a clear pattern of exhaust integrity issues that any prospective buyer must prioritise. The 2026-06-17 test returned a pass, but the previous year's record tells a more complicated story. On 2025-06-20 the vehicle failed outright on three related major defects: carbon monoxide content exceeding manufacturer specified limits after the second fast idle, hydrocarbon content exceeding manufacturer specified limits after the same test phase, and Lambda reading outside the specified limits. A re-test just three days later on 2025-06-23 produced a clean pass with no defects recorded, suggesting remedial work was carried out in the intervening period. Buyers should not assume this resolved the underlying issue permanently, as emission control faults on petrol vehicles of this age often trace to lambda sensors, catalytic converter efficiency, or pre-cat exhaust leaks allowing false air ingress, and recurrence within a year or two is not uncommon. The latest advisory items regarding rear tyre wear and sidewall damage are routine but warrant immediate replacement to maintain roadworthiness. With 113,969 miles recorded over an 11 year span, this TT has covered approximately 10,361 miles annually, which sits squarely within typical usage parameters for its age and suggests consistent rather than intermittent use. There are no notable gaps in the testing history that would imply long periods off the road, which is positive from a corrosion and seal degradation perspective, but the moderate-to-high accumulated mileage means wear items such as suspension joints, brake components, and drivetrain mountings have all experienced their full working life. The annual mileage is high enough that consumable replacement should be assumed, but not so excessive as to raise immediate concerns over premature structural fatigue beyond normal expectations for the platform. Given the documented rear shock absorber oil misting advisories from the 2023-06-07 test, a careful inspection of the rear damping is essential. Although only light misting was noted at that stage, oil seepage from shock absorbers tends to progress once initiated, and by now three years later the units may be showing more pronounced leakage or degraded damping performance. During a test drive, listen for clonking or knocking noises from the rear suspension over uneven surfaces, and pay particular attention to whether the vehicle exhibits excessive float, pitch, or rear-end instability over undulating roads, which would indicate the shocks are no longer effectively controlling body movement. Visually inspect the rear shock bodies for fresh oil residue, wetness around the top mountings, and any staining on the spring seats or surrounding underbody panels. The rear tyre wear pattern flagged in the most recent advisory deserves close physical examination before purchase. Worn close to the legal limit combined with edge wear and inner sidewall cutting suggests either incorrect rear wheel alignment, insufficient camber adjustment, or potentially compromised suspension geometry stemming from worn bushes or trailing arms. On a test drive, check for any pulling to one side, vague or inconsistent steering response, or a feeling of instability from the rear axle over mid-corner bumps. Inspect the inner sidewalls of all four tyres carefully for cracking, bulging, or exposed cord, as inner sidewall damage is often associated with geometry issues rather than simple inflation problems. Finally, given the recent emissions failures, insist on seeing evidence of the remedial work carried out between the failed and passed 2025 tests, and consider an independent pre-purchase inspection with particular focus on exhaust gas readings, lambda sensor function, and catalytic converter integrity to ensure the underlying cause has been genuinely resolved rather than temporarily masked.