2017 BMW 420 2.0L Diesel · RO02 ENA

The most recent MOT test on the 2017 BMW 420i, conducted on 2026-07-21, resulted in a clean pass with no recorded defects. This follows a consistent pattern over the past five years, where all MOT assessments prior to 2023 were also passed without issues, indicating a stable maintenance record. However, the single advisory from 2023—brake pads wearing thin at the rear—suggests a gradual but persistent wear concern that has not been addressed or rectified since then. This advisory alone does not automatically disqualify the vehicle from purchase, but it warrants closer attention during a pre-purchase inspection, as it may reflect underlying issues with brake system longevity or improper maintenance. The absence of further failures or advisories in subsequent tests implies that the wear may be contained, but the buyer should be mindful of potential future costs associated with brake replacement. The vehicle’s recorded mileage of 71,988 miles is consistent with its age, approximately 7,999 miles per year, which is within the expected range for a BMW of this class under typical UK usage patterns. This mileage distribution does not suggest excessive wear from high annual mileage, but it also does not indicate light or infrequent use either. The absence of significant mileage gaps or rapid accumulation over the years suggests a steady operational profile, though the advisory on brake pad wear could imply that the vehicle has been driven regularly enough to accelerate wear, particularly if the owner has not addressed the issue promptly. For a 9-year-old car, this mileage is neither alarming nor exceptional, but the brake advisory remains a critical point to investigate further. Given the clean MOT history with no defects and the relatively stable mileage, the buyer should conduct a thorough pre-purchase inspection focusing on the brake system, as the rear brake pad wear advisory is the most notable recurring issue. During this inspection, verify the condition of the brake discs, calipers, and linings, checking for signs of glazing, warping, or uneven wear that could indicate deeper problems such as binding calipers or hydraulic issues. Listen for any unusual brake pulsation or shudder during braking, which may signal warped discs or internal brake component failure. Additionally, check for fluid leaks around the brake master cylinder and wheel cylinders, as moisture contamination or air in the system can exacerbate wear. If the brake pads are indeed thin but the discs appear in good condition, the wear may be due to prolonged standing or infrequent use, though the advisory suggests otherwise. Beyond the brake system, the buyer should also assess the vehicle’s structural integrity and fluid condition, as age and moderate mileage can still introduce wear-related risks. Inspect the tyre tread depth and sidewall condition for signs of perishing, cracking, or dry rot, which can compromise safety, especially at higher speeds. Check for uneven tyre wear patterns, which may indicate misalignment, suspension issues, or incorrect camber settings. The suspension components, including coil springs, shock absorbers, and suspension bushes, should be examined for signs of excessive play, corrosion, or physical damage, as these can degrade over time and affect handling stability. A test drive should include checking for excessive clunking or rattling in the suspension, particularly when driving over bumps or at speed, which may reveal worn or failing components. Lastly, verify the condition of the 12V battery and starter motor, as a 9-year-old vehicle may experience reduced cranking power or electrical system inefficiencies due to battery degradation or parasitic drain. Test the battery’s voltage at rest and while the engine is running, and listen for unusual clicking or grinding noises when attempting to start the vehicle, which could indicate a failing starter or solenoid. If the battery is over 5 years old, consider replacing it to prevent long-term electrical system failures.