2009 Mercedes-Benz B-Class 1.5L Petrol · FH09 CDK

The most recent MOT test on 11 August 2025 resulted in a pass, although the same date records a prior fail with three major defects that were subsequently rectified: misaligned windscreen washer jets, an offside rear direction indicator showing incorrect colour, and a nearside front headlamp with severely reduced light intensity. These items are relatively straightforward electrical and maintenance concerns rather than indicators of fundamental mechanical decline. However, two advisories remain live from that test, namely slightly worn rear shock absorber bushes on both sides and a slightly loose rear bumper. The overall pattern across the past four years shows a vehicle that has consistently passed after addressing isolated failures, but with a recurring theme of brake pipe corrosion advisories first noted in 2021 and persisting into 2022, plus repeat advisories relating to anti-roll bar linkage components and rear shock absorber bushes. This suggests a maintenance profile that is broadly stable but with progressive wear to underbody and suspension items that a buyer should not overlook. With 129,344 miles recorded over approximately 17 years, this B-Class is averaging around 7,600 miles per annum, which is broadly typical for its age and segment. There are no extended gaps in the MOT history indicative of long periods off the road, and the mileage accumulation appears steady, pointing to regular if moderate driving rather than sustained high-mileage motorway use or extended standing. Mechanically, this usage pattern is generally favourable as it implies that consumables such as the clutch, drivetrain, and engine internals have experienced consistent working temperature cycles and have not been subjected to the severe corrosion risks associated with prolonged storage, nor the accelerated wear typical of very high-mileage examples. The recurring brake pipe corrosion advisories and the major failures relating to excessively corroded front-to-rear brake pipes in August 2021 are the most significant items in the history. Although the vehicle subsequently passed, brake pipe corrosion tends to progress, particularly on a vehicle of this age exposed to winter road salts. A prospective buyer should thoroughly inspect the underbody for any seepage of brake fluid, crusting or flaking along the brake lines, and any evidence of recent pipe replacement or sealing. Equally, the 2024 advisory regarding the offside front anti-roll bar linkage ball joint dust cover and the 2022 minor for a deteriorated nearside front dust cover suggest that the front suspension bushes and anti-roll bar drop links warrant close attention. On a test drive, listen for clonks or knocks over uneven surfaces, particularly from cold, and feel for any vagueness or looseness through the steering. The 2025 advisory on rear shock absorber bushes is also worth noting; worn bushes manifest as reduced ride refinement, vague rear handling, and possible rattling over rougher tarmac. Beyond the recorded defects, a vehicle of this age and mileage warrants thorough age-related inspection regardless of MOT outcome. Tyres should be examined for both tread depth and sidewall perishing or cracking, as rubber degrades with calendar age even when mileage is modest. The 12-volt battery is likely due for replacement given the vehicle's age, and starting behaviour in cooler conditions should be verified. Brake discs, particularly the rears, may exhibit corrosion or surface pitting from standing or light use, and calipers should be checked for binding by confirming the vehicle rolls freely on a level surface after the handbrake is released. All fluid services, including engine oil, coolant, brake fluid, and automatic transmission fluid if applicable, should be confirmed via the service book, as calendar-based degradation affects brake fluid hygroscopically and coolant anticorrosion additives over time. Finally, given the 2024 and 2025 washer jet failures, verify full washer function and headlamp alignment and output before purchase, as these items have now failed twice in three years.