2021 Audi A4 S Line 40 TDI Mhev Quat SA 2.0L Diesel · Y30 ROG

The Audi A4 S Line in question presents a clean MOT history, with both recent tests—conducted in November 2024 at 16,957 miles and October 2025 at 23,351 miles—resulting in a full pass with no advisories or defects recorded. This consistency suggests the vehicle has been well-maintained within the scope of the MOT test, with no signs of recurring mechanical or structural issues. The absence of advisories on critical components such as brakes, suspension, or emissions indicates that, at the time of testing, the car met all DVSA roadworthiness standards without major concerns. However, the short interval between tests (just over a year) and the low mileage accumulation (around 6,400 miles in that period) may mask deferred maintenance or minor wear that isn’t yet severe enough to trigger an MOT failure. The mileage pattern—approximately 4,670 miles per year—is notably low for a five-year-old vehicle, raising questions about usage patterns. Such low mileage could imply the car has spent extended periods in storage or has been driven sparingly, which may reduce wear on consumables like tyres and brake pads. Alternatively, it might reflect a secondary or occasional-use vehicle. The gap between the 2023 MOT (not provided) and the first recorded test in 2024 suggests a potential lapse in documentation, though the absence of defects in the two available tests does not indicate neglect. Buyers should verify whether the mileage aligns with the vehicle’s actual usage history, as prolonged inactivity can lead to issues such as seized bearings, degraded seals, or battery degradation—none of which would be captured in an MOT. Given the lack of recorded faults, a prospective buyer should focus their inspection on components less frequently scrutinised by MOT testers but prone to silent degradation in low-mileage vehicles. Pay particular attention to the condition of the MHEV (mild hybrid) battery and its cooling system, as hybrid components can degrade even with minimal use. Check for signs of fluid leaks—especially around the turbocharger, intercooler, and differential—since these can indicate neglected maintenance. The suspension should be inspected for stiffness or uneven wear, particularly in the rear, where binding or worn bushes might not yet be severe enough to fail an MOT but could develop into a problem. Finally, verify the health of the exhaust system for corrosion or loose mounts, as rust can spread rapidly in vehicles with intermittent use. While the MOT history is reassuring, a thorough pre-purchase inspection by a qualified mechanic remains essential to confirm the car’s overall condition beyond the DVSA’s minimum standards.