2017 BMW 420 2.0L Diesel · YA17 VSE

The 2017 BMW 420 presents a highly stable and improving maintenance trend, culminating in a completely clean pass at its most recent MOT on 20 October 2025 at 94,233 miles. Not a single defect was recorded during this test, nor in any of the preceding four examinations. This unblemished record indicates a vehicle that has been consistently maintained to a high standard, with no recurring mechanical or structural issues requiring tester intervention. The vehicle's age and recorded mileage align perfectly, averaging approximately 10,470 miles per year, which sits squarely within typical usage parameters for a nine-year-old executive coupe. Between the 2024 test at 79,891 miles and the 2025 test at 94,233 miles, the car covered 14,342 miles in just under twelve months. This represents a notable uptick in usage compared to the previous annual average of around 17,000 miles between 2022 and 2023, suggesting a shift toward more regular, higher-mileage driving recently. The mid-year test in June 2022 at 44,858 miles, followed by a retest in October 2022 at 47,469 miles, shows a short gap with minimal mileage accumulation, likely indicating a routine early test rather than a failure-driven retest given the subsequent clean passes. Despite the flawless MOT history, a physical inspection remains essential. The recent jump in annual mileage warrants a close examination of high-wear consumables. Check the condition of the brake discs and pads for uneven wear, and inspect the tyres for tread depth and sidewall damage, as increased mileage accelerates their degradation. Suspension bushes and coil springs should be scrutinised for cracking or corrosion, common issues on BMWs that might not yet trigger an MOT failure but affect ride quality. A thorough visual check of the underbody and subframes is also required. While the MOT tester found no corrosion concerns, BMW models of this era can suffer from subframe mounting point corrosion that requires close scrutiny. The exhaust system and catalytic converters must be inspected for leaks or deterioration, ensuring the car remains compliant with stringent emissions standards given its recent high usage.