Mercedes-Benz B-Class (W245)
The Mercedes-Benz B-Class (W245) is a practical, high-roof family hatchback that shares much of its clever sandwich-floor mechanicals with the A-Class W169. It was positioned as a premium mini-MPV, offering vast interior space and a raised driving position without the bulky footprint of an SUV. In the UK, it makes for sensible and spacious family transport with moderate insurance groups, though running costs can spike if major repairs are needed. While generally reliable, the CVT automatic gearbox, diesel DPF clogging, and seat belt webbing wear are the main traps, making it best suited for older drivers or small families prioritizing comfort and space.
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Common Faults & Reliability
These are the most common documented problems for the Mercedes-Benz B-Class (W245), sorted by their typical impact and frequency.
CVT gearbox failure
high severityThe CVT transmission can suffer from worn variators, overheating and mechatronic unit failures. Jerky acceleration and whining noises are common. Regular fluid changes are critical to延 life.
DPF blockage (diesel models)
medium severityThe diesel particulate filter clogs quickly on short urban journeys, triggering limp mode. Regular motorway driving is needed for passive regeneration.
Seat belt webbing fraying
medium severityThe seat belt webbing on B-Class models is prone to premature fraying at the edges, which is an MOT failure. Replacement belts are surprisingly expensive.
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