2005 Mercedes-Benz B-Class 2.0L Diesel · DG55 YGE

The most recent MOT test on 14 August 2026 resulted in a pass, but the vehicle carries forward a number of advisories that warrant careful attention. The cluster of items relating to the rear tyres is significant: both rear tyres show signs of perishing or cracking, a slow puncture caused by a nail is present on the nearside rear, and the nearside rear direction indicator is discoloured. Additionally, oil level on minimum is noted, which is a basic but important maintenance concern on a vehicle of this age. Looking at the broader history, the pattern is one of moderate decline rather than stability. The 2023 test produced a dangerous failure for parking brake efficiency of less than 50 percent, alongside significantly worn rear brake discs and an inoperative parking brake on both sides, which were subsequently rectified. More recently, the 2025 test produced a PRS failure for the supplementary restraint system warning lamp, and the 2026 test repeated this same major defect, suggesting the airbag or SRS fault has either not been properly addressed or has recurred. An illuminated SRS warning lamp is a major safety concern and should be fully diagnosed and rectified by a specialist before purchase. With 125,013 miles recorded over 21 years, the vehicle has covered approximately 5,953 miles annually, which is well below the average for a car of this age. While low annual mileage reduces wear on major drivetrain components, it raises particular concerns for a 21-year-old vehicle. Extended periods of standing or infrequent use accelerate issues such as brake disc corrosion and caliper seizure, degradation of rubber components including suspension bushes and coolant hoses, and premature ageing of the 12V battery. The annual MOT pattern shows reasonable consistency with no major gaps, though the recurring brake and suspension advisories are consistent with a vehicle experiencing age-related wear rather than mileage-induced wear. Buyers should interpret the low mileage as a mixed indicator: engine and gearbox internals may be in relatively good condition, but age-related deterioration of ancillary systems is highly likely. Several recurring defect themes require careful physical inspection and test drive evaluation. The supplementary restraint system warning lamp has been flagged on the two most recent tests and must be diagnosed using a Mercedes-compatible diagnostic tool to identify whether the fault lies within the airbag module, a seatbelt pretensioner, a crash sensor, or the wiring loom beneath the seats, which is a known weak point in this era of B-Class. The rear suspension arm pin or bush wear noted in 2025 is a common issue on this platform and warrants a thorough inspection, ideally with the vehicle raised, checking for any play in the rear trailing arms and accompanying bushes; on a test drive, listen for clonking or knocking noises over speed humps and uneven surfaces, and observe whether the rear end feels unsettled or loose. The brake system history also demands attention: with rear brake discs having previously been significantly worn to the point of major failure, and front and rear discs showing wear in 2025, the buyer should inspect pad and disc condition visually through the wheels, check for any binding calipers that may have seized from standing, and during a test drive feel for any brake shudder, pulling to one side, or a soft or spongy pedal feel, while also verifying the operation and holding ability of the parking brake on an incline. Given the vehicle's age and the advisories recorded, a prospective buyer should carry out a number of practical checks beyond the MOT record. The rear tyres should be replaced regardless of legal tread depth, as the recorded perishing and cracking indicates the rubber compound is at the end of its service life, and a nail repair should be verified as properly conducted. The engine oil should be checked on the dipstick and topped up, with a service history review to confirm when the oil and filter were last changed, as a minimum oil reading on a freshly serviced engine would suggest neglect or an oil consumption issue, particularly relevant on the M266 petrol or OM640 diesel engines commonly fitted to this model. Coolant, brake fluid, and automatic transmission fluid (if applicable) should be inspected for condition and age, as these degrade on a calendar basis regardless of mileage, and a brake fluid test strip or refractometer check would be prudent. The exhaust should be examined for the minor leak noted in 2025, listening for any increase in exhaust noise or ticking from the front section. Other age-related concerns include testing the 12V battery under load, checking for any signs of corrosion around the wheel arches, sills, and underbody, and verifying that all electrical systems, including the air conditioning compressor and central locking, function correctly. A pre-purchase inspection by a Mercedes-Benz specialist or a reputable independent garage with diagnostic equipment would be strongly advisable to uncover any issues not visible on the MOT record.