2015 Mercedes-Benz B-Class 1.5L Diesel · FD65 WDZ

The most recent MOT test conducted on the 2015 Mercedes-Benz B-Class on 2025-12-05 resulted in a failure, with the primary issue being a compromised offside front anti-roll bar linkage ball joint dust cover that has allowed dirt ingress, leading to significant wear and mechanical instability at that joint. This failure follows a pattern of recurring defects, particularly in the suspension and structural components, which have appeared intermittently over the past two years. While there was a passing MOT in late 2024, the earlier failures in 2023 and 2024—including a persistent engine warning light (MIL) and non-functional lamps—suggest a history of unresolved or deferred maintenance issues that may have contributed to the current suspension failure. The advisory of a cracked offside rear lens in 2023 and the bulging tyre in 2023 also indicate that the vehicle has faced critical roadworthiness concerns that should not be ignored, particularly the tyre failure, which is a dangerous defect requiring immediate rectification. The recorded mileage of 70,572 miles for a vehicle aged approximately 11 years represents a moderate annual usage rate of around 6,416 miles per year, which is within the expected range for a car of this age and class. However, the mileage data alone does not fully explain the vehicle’s maintenance history, as the gaps between MOT tests vary significantly, with some periods showing minimal usage—such as the absence of defects in 2022 and 2021—while others reveal rapid wear progression, like the tyre failure in late 2023. The anti-roll bar linkage failure in 2025, combined with the prior engine warning light and lamp failures, suggests that the vehicle may have been driven under conditions that accelerated component wear, particularly in the suspension, electrical systems, and drivetrain. The presence of a bulging tyre is particularly concerning, as this typically indicates internal structural failure that could compromise tyre integrity and safety, warranting immediate replacement. Given the recurring suspension and structural defects, the prospective buyer should prioritise a thorough inspection of the front anti-roll bar linkage system, including the ball joints, bushings, and associated mounting points for signs of excessive play, corrosion, or physical damage. During a test drive, listen for unusual noises such as clunks or rattles from the front suspension, particularly when cornering or over bumps, which may indicate loose or worn suspension components. Inspect the anti-roll bar linkage for any visible signs of deformation, cracks, or excessive wear on the ball joints, and check for uneven tyre wear or excessive squirm, which could signal misalignment or suspension issues. The engine warning light (MIL) from the 2024 MOT failure suggests an ongoing electrical or sensor issue that should be diagnosed by a qualified mechanic, as persistent engine faults can lead to reduced reliability and potential long-term damage. Additionally, the cracked rear lens is a cosmetic issue but should be addressed promptly to prevent further damage from moisture ingress. For the buyer, the age and mileage of this vehicle mean that several time-sensitive checks are critical, particularly those related to fluid degradation and structural integrity. Given the vehicle’s age, the 12V battery should be tested for capacity and cleanliness, as standing vehicles can lead to corrosion on terminals or a failing battery due to prolonged disuse. Brake systems should be inspected for signs of corrosion on discs, binding calipers, or uneven wear, as standing can cause moisture to penetrate brake components, leading to rust and reduced braking performance. The suspension components, especially the front anti-roll bar linkage, are particularly vulnerable to wear at this mileage, so any signs of excessive play or noise should be addressed without delay. The tyre condition is paramount, and while the bulging tyre failure in 2023 has been rectified, the buyer should verify that all tyres are within legal limits for tread depth and free from visible damage, as older tyres can develop sidewall cracks or perishing from prolonged exposure to the elements. Finally, the buyer should request service records to confirm that the vehicle has undergone regular fluid top-ups, particularly brake fluid, which can degrade over time and become corrosive if left unserviced.