2020 Audi Q3 S Line 35 TDI S-A 2.0L Heavy oil · KV70 RYJ

A recurring pattern of rear friction component wear and a significant emissions failure during its mid-life testing cycle form the core mechanical narrative of this 2020 Audi Q3. The vehicle successfully passed its most recent MOT on 26 March 2026 with no defects recorded, improving upon a turbulent September 2025 inspection where it initially failed due to exhaust emissions exceeding manufacturer limits alongside advisories flagging perishing rear tyres, pitted brake discs, and thinning pads. This trajectory indicates that while the immediate roadworthiness standards have been restored for the latest test, the underlying hardware has experienced notable thermal and mechanical stresses in previous years. Accumulating 42,463 miles across roughly six years yields an average of approximately 7,077 miles annually, aligning closely with typical UK driving patterns for a compact premium SUV. This steady, moderate mileage accumulation avoids the risks associated with prolonged stationary storage, such as brake rotor oxidation or fluid degradation, while maintaining standard operational wear on drivetrain components. The absence of extended testing gaps confirms that the vehicle has remained in continuous commission, undergoing regular annual evaluations without suspicious lapses in its roadworthiness timeline. Prospective buyers must prioritise a thorough physical inspection of the rear braking system, given that both rear discs and pads were highlighted for wear and pitting in consecutive MOT tests spanning 2024 and 2025. During a static check, visually inspect the thickness and surface condition of the rear brake rotors through the alloy wheels to verify if they have been recently replaced or if deep scoring remains. On the test drive, pay close attention to the brake pedal feel for any pulsing or judder during application, and listen for scraping or grinding noises from the rear axle that would confirm advanced friction material depletion or rotor degradation. The historical emissions failure demands careful scrutiny of the exhaust system and engine management health, particularly regarding modern particulate filtration and fuel delivery efficiency. When starting the vehicle from cold on the test drive, observe the exhaust tailpipe for any abnormal smoke or pungent hydrocarbon odours, and ensure the engine idles smoothly without hesitation or warning lights on the dashboard. It is also essential to inspect the rear tyres closely for the sidewall cracking and perishing noted in the 2025 record, ensuring that any rubber showing age-related degradation has been replaced with matching quality tyres possessing adequate tread depth.