2017 BMW 420 2.0L Diesel · AV02 LMV

The most recent MOT test for this BMW 420i occurred on 9th December 2025, where it passed without any recorded defects, indicating a stable maintenance record in the immediate period. However, the vehicle’s history reveals a pattern of recurring issues, particularly with the tyre pressure monitoring system (TPMS), which failed in both April 2021 and April 2022. These failures suggest a persistent electronic fault that may stem from a faulty sensor, wiring issue, or software glitch within the vehicle’s body control module. Additionally, while the vehicle passed subsequent MOTs without major defects, the presence of advisories—such as thin brake pads, near-legal tyre wear, and misting shock absorbers—demonstrates ongoing wear and potential long-term degradation if not addressed promptly. The absence of failures in the last two years suggests either effective corrective action or a temporary resolution, but the advisories warrant proactive attention to prevent escalation into major issues. The vehicle’s recorded mileage of 110,642 miles at the time of assessment represents a high annual usage rate of approximately 12,294 miles per year, which is notably elevated for a nine-year-old car. Such mileage accumulation typically accelerates wear on consumables like brake pads, tyres, and suspension components, as well as fluid degradation in the cooling, hydraulic, and lubrication systems. The rapid mileage suggests either heavy daily use, frequent short trips, or a combination of both, which can exacerbate issues like brake pad thinning, tyre wear patterns, and potential oil contamination in the shock absorbers. Additionally, the absence of significant mileage gaps between MOTs implies consistent operation, which may have contributed to the observed wear but also indicates that the vehicle has been in regular service rather than left stationary for prolonged periods. This usage profile demands particular vigilance for fluid condition, suspension integrity, and brake system efficiency. For a prospective buyer, the most critical areas to inspect during a physical examination and test drive are the brake system, suspension, and tyres. The recurring advisories on thin brake pads and near-legal tyre wear indicate that the braking efficiency and tyre grip may be compromised. On a test drive, listen for uneven brake pedal travel, pulsations, or a spongy feel, which could signal warped discs, binding calipers, or hydraulic system issues. Inspect the brake discs for corrosion, scoring, or excessive glazing, and check the pads for glazing or uneven wear. The misting shock absorbers noted in the 2024 MOT advisory suggest potential oil leakage or internal failure; test for excessive body roll, clunking noises from the rear suspension, or uneven coil spring compression. Additionally, verify the tyre tread depth and sidewalls for cracks or perishing, as the near-legal wear advisories point to potential sidewall damage from high-speed driving or improper inflation. Addressing the TPMS malfunction, which failed twice, should be prioritised, as a non-functional system cannot provide accurate tyre pressure readings, leading to uneven wear and reduced fuel efficiency. Beyond the immediate advisories, the vehicle’s age and high mileage necessitate a broader inspection of fluid condition and structural integrity. Given the nine-year age and 110,642 miles, check the engine oil, coolant, brake fluid, and differential fluid for signs of degradation, such as sludge, contamination, or colour changes, as these fluids degrade over time regardless of mileage. Inspect the battery for corrosion on terminals, a swollen case, or reduced voltage, as standing vehicles or high mileage can accelerate battery failure. Check for signs of rust or corrosion on the chassis, particularly around the wheel arches, undercarriage, and exhaust system, as prolonged exposure to moisture can compromise structural integrity. Finally, verify that all service records are up to date, particularly for the timing belt (if applicable), suspension components, and exhaust emissions compliance, as BMWs of this era often require specific interval servicing to prevent catastrophic failures. A thorough test drive should also include checking for exhaust emissions leaks, which could indicate catalytic converter or manifold issues, and listening for unusual noises from the drivetrain or transmission.