2017 Mercedes-Benz GLA 2.1L Diesel · WL62 KER

The most recent MOT test for this 2017 Mercedes-Benz GLA occurred on 2025-09-02, where it failed with two major defects and a minor windscreen issue. This marks a notable deviation from the vehicle’s previous MOT history, which had consistently passed without recorded defects since 2020. The failure highlights a recurring problem with the near-side front outer drive shaft constant velocity (CV) joint boot, which has been compromised, allowing dirt ingress and potential internal wear on the CV joint and differential. Additionally, the near-side front headlamp lens was deemed seriously defective, which could affect visibility and potentially require replacement. While the failure is concerning, the absence of further failures in the intervening months suggests that the issues may have been addressed or are not yet critical, but the buyer should prioritise resolving these defects to restore roadworthiness and prevent further mechanical deterioration. The vehicle’s recorded mileage of 79,573 miles over approximately nine years represents an average annual usage of around 8,841 miles, which is within the expected range for a GLA of this age. However, the mileage data does not reveal significant periods of high or low usage, which could indicate either consistent moderate driving or prolonged periods of inactivity. Prolonged standing without use can lead to specific issues such as brake disc corrosion, binding caliper pistons, and fluid degradation in hydraulic systems, whereas higher mileage would accelerate wear on suspension components, drivetrain seals, and tyre tread depth. The absence of high-mileage outliers suggests that while wear may be gradual, the CV joint boot failure could have been exacerbated by either prolonged exposure to road debris or inadequate maintenance of the drive shaft system. Given the recent MOT failures, the prospective buyer must prioritise addressing the CV joint boot and headlamp lens defects immediately. The CV joint boot failure is a critical mechanical issue, as it compromises the integrity of the CV joint and differential, leading to potential bearing wear, excessive noise from the drive shaft (particularly when turning corners or accelerating), and increased risk of internal joint failure. On a test drive, listen for a persistent whine or clunking from the near-side front wheels, especially at low speeds or when cornering, and check for uneven tyre wear that could indicate misalignment or drive shaft issues. The headlamp lens defect, while not directly safety-critical, should be replaced to ensure proper illumination and compliance with legal standards. The frayed rear seatbelt advisory from 2020 should also be addressed, as a fully functional seatbelt system is mandatory for roadworthiness and occupant safety. For a vehicle of this age and mileage, the buyer should conduct a thorough physical inspection beyond the MOT checks. Examine the tyres for sidewall cracking or perishing, which can occur even with moderate mileage due to age-related degradation of the rubber compound. Check the brake discs for corrosion or excessive glazing, which may indicate standing corrosion or poor braking performance, and inspect the caliper pistons for binding or leakage. The suspension should be inspected for signs of worn suspension bushes, coil spring damage, or excessive play in the struts, as these components wear progressively with use. Additionally, verify the condition of the 12V battery and starter motor, as prolonged inactivity can lead to sulphation or corrosion in the battery terminals. Fluid levels—particularly brake fluid, coolant, and differential fluid—should be checked for contamination or degradation, with a reminder that hydraulic fluids like brake fluid lose effectiveness over time and should be replaced every two years or 60,000 miles, whichever comes first. Finally, ensure that the service history is up to date, particularly for the CV joint boot replacement and any recent fluid servicing, to confirm that the vehicle has been maintained according to manufacturer recommendations.