Mercedes-Benz B-Class (W246) Problems by Year
The Mercedes-Benz B-Class (W246) is a practical, high-roof alternative to the A-Class, offering a vastly improved interior and better driving dynamics than its W245 predecessor. It is positioned as a premium family MPV, providing excellent visibility, easy ingress, and a spacious cabin for those who don't want an SUV. In the UK, it makes for very sensible, comfortable family transport with low running costs and reasonable insurance. However, it shares the same dual-clutch transmission (DCT) and diesel emissions risks as the W176 A-Class, making it best suited for mature drivers or families needing flexible premium space.
Select a year below to see the specific problems affecting that model year, with estimated repair costs and severity ratings.
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Browse Mercedes-Benz B-Class (W246) in our Directory
View MOT history, registration data, and reliability scores for the Mercedes-Benz Mercedes-Benz B-Class (W246).
View Mercedes-Benz B-Class (W246) DirectoryBuying Tips for the Mercedes-Benz B-Class (W246)
- ✓Check the 7G-DCT automatic gearbox for smooth operation; missing the 3-year/30,000-mile fluid change can cause juddering and mechatronic failure.
- ✓On the popular 1.5-litre diesel (OM607, shared with Renault), ensure the timing belt has been changed on schedule.
- ✓Inspect the panoramic sunroof for smooth opening and check the footwells for dampness, as blocked drainage tubes are a common source of leaks.
- ✓Listen for rattles from the interior trim, particularly around the floating infotainment screen and dashboard fascia.
- ✓Check for warning lights relating to the DPF on diesel models used purely for short school runs or urban driving.
- ✓Verify that the collision prevention assist radar doesn't throw random warnings on the dashboard, which can be caused by dirt or a failing sensor.