2021 Mercedes-Benz GLB 220 AMG Line Prem D 4M A 1.9L Diesel · SC13 ECK

This 2021 Mercedes-Benz GLB demonstrates a stable but deteriorating maintenance trend regarding consumable wear items, culminating in its most recent test on 26 February 2026 at 48,171 miles. The vehicle passed that examination, though the tester issued an advisory for the nearside rear tyre showing slight damage, cracking, or perishing. Previous tests have remained clear of major mechanical failures or structural advisories, yet the gradual emergence of wear-related defects indicates the car is now entering a phase requiring more rigorous upkeep. Mileage accumulation aligns closely with typical UK averages for a five-year-old vehicle. The GLB has covered roughly 9,600 miles annually, progressing from 31,515 miles in February 2024 to 40,656 miles in February 2025, and finally reaching 48,171 miles by February 2026. This consistent, steady progression rules out periods of prolonged standing or aggressive fleet usage. The MOT record is notably sparse for a car of this age, containing no historical failures or serious structural advisories, which suggests routine servicing and mechanical care were maintained during its early life. Despite the clean structural record, the recent history flags specific consumable components that demand immediate physical verification. The February 2026 perishing advisory on the nearside rear tyre is a clear red flag; perishing rubber often implies age degradation or prolonged exposure to under-inflation, and replacing this tyre is non-negotiable. Just one year prior, in the February 2025 test at 40,656 miles, the tester noted rear brake pads wearing thin. While replacing pads is a standard service item, the subsequent tyre advisory a year later suggests the current owner delayed basic upkeep once the vehicle cleared its MOT. A buyer must verify the current condition and genuine replacement of those rear brake pads, alongside a thorough inspection of the disc faces for scoring or lip buildup. Prospective buyers should focus their physical inspection on the underbody and suspension components to ensure the clean MOT record genuinely reflects structural integrity rather than tester leniency. The 2024 test noted exhaust emissions too low to register, which is a standard diagnostic quirk on some diesel particulate filter systems during cold starts, but it warrants a driven assessment to confirm the DPF is achieving normal operating temperature and completing regeneration cycles. Verify the rear seatbelt mechanism that was obscured by a child seat in 2024 operates correctly, and insist on recent proof of oil and transmission fluid services to match the consistent mileage pace.