2021 Mercedes-Benz V 300 AMG Line D Auto 1.9L Diesel · LL71 AOB

The most recent DVSA MOT test for the 2021 Mercedes-Benz V 300 AMG Line D Auto was conducted on 2025-09-01, but the vehicle’s latest official inspection before that was on 2025-11-05, which passed without recorded defects. However, the preceding MOT on 2024-11-20 resulted in a failure due to critical issues: the electronic parking brake system being inoperative, a serious fluid leak from the nearside rear shock absorber, and an inability to test brake performance. These failures indicate a concerning pattern of mechanical degradation rather than a stable maintenance record. The fact that the vehicle passed the 2025-11-05 test without these same defects suggests either a temporary resolution of the issues or that the MOT inspector did not identify the same underlying problems, which raises questions about the reliability of the vehicle’s components over time. Buyers should proceed with caution, as the presence of major failures in the prior year’s test underscores the need for thorough pre-purchase inspection and immediate attention to the identified issues. The recorded mileage of 105,507 miles for a vehicle aged five years represents a high annual usage rate of approximately 21,101 miles per annum, which is significantly above the average for its class and age. Such mileage accumulation typically accelerates wear on critical systems, including suspension components, brakes, and drivetrain elements. The nearside rear shock absorber failure, in particular, is highly indicative of excessive use, as fluid leaks and structural damage from repeated compression cycles are common in high-mileage vehicles. Additionally, the electronic parking brake system’s inoperability may stem from wear in the actuator or wiring harness, which can degrade faster under heavy or frequent use. While lower mileage might suggest less wear, the current usage profile suggests that the vehicle has undergone significant mechanical stress, warranting a rigorous inspection to assess the extent of component degradation and the likelihood of future failures. Given the recent MOT failures, the buyer must prioritise addressing the immediate issues before proceeding with purchase. The electronic parking brake control being inoperative could be due to a faulty actuator, solenoid, or wiring fault, which may require replacement of the entire system or individual components. Symptoms to watch for during a test drive include the parking brake not engaging fully, a grinding or dragging sensation when applying it, or the vehicle drifting when parked. The serious fluid leak from the nearside rear shock absorber demands immediate attention, as continued operation will lead to further damage, reduced suspension effectiveness, and potential handling instability. Listen for clunking or harshness in the rear suspension when driving over bumps, and check for oil pooling beneath the vehicle. The brake performance test failure suggests potential issues with disc thickness, warping, or binding calipers, which could cause uneven braking, pulsation, or a spongy pedal feel. Inspect brake discs for corrosion, scoring, or uneven wear, and check for binding in the caliper pistons, which may indicate fluid leakage or seized components. If the buyer proceeds with the purchase despite these defects, they should arrange for a comprehensive pre-purchase inspection by a qualified independent mechanic familiar with high-mileage AMG models. In the interim, the vehicle should be removed from service to prevent further damage. For the nearside rear shock absorber, replacement is strongly advised, as the fluid leak will continue to degrade the damper and compromise ride quality. The electronic parking brake system should be fully serviced or replaced, and the brake system inspected for any underlying issues, including fluid levels, disc and pad condition, and hydraulic integrity. While the MOT history shows no subsequent failures, the high mileage and prior critical issues mean the vehicle’s long-term reliability is uncertain. Buyers should also consider the cost of potential future repairs, particularly given the AMG’s reputation for expensive maintenance, and weigh this against the vehicle’s market value and intended use. If the purchase is finalised, ensure that all necessary repairs are completed promptly to restore the vehicle’s roadworthiness and performance.