2011–2018 Mercedes-Benz B-Class (W246)
Browse our directory of 2011–2018 Mercedes-Benz B-Class (W246) vehicles. Access instant MOT history reports, tax status, and reliability insights for any registration listed below.
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Common Problems & Reliability
The 2011–2018 Mercedes-Benz B-Class (W246) has 3 known issues. 3 are moderate concerns worth inspecting before purchase.
7G-DCT Gearbox Judder
ModerateThe dual-clutch automatic can become hesitant or jerky if clutch wear is present or fluid changes have been skipped.
Symptoms: Shuddering when pulling away, Delay engaging reverse
Est. repair cost: £400–£1,500
OM651 Diesel Timing Chain Tensioner Oil Leak
ModerateThe gasket on the timing chain tensioner is a frequent leak point. Oil loss can reduce tensioner pressure and lead to chain rattle and eventual stretch.
Symptoms: Oil leak on the right side of the engine block, Burning oil smell...
Est. repair cost: £200–£500
Water ingress in boot from rear air vent seals
ModerateThe rear air vent seals behind the bumper can fail, allowing water into the boot. This can damage the rear SAM electrical module, causing lighting and locking faults.
Symptoms: Damp or wet boot floor, Random rear light faults...
Est. repair cost: £100–£500
Buying Tips for the 2011–2018 Mercedes-Benz B-Class (W246)
- ✓Check the 7G-DCT gearbox for juddering in stop-start traffic; fluid changes every 3 years/31,000 miles are vital
- ✓Look out for water ingress in the boot, often caused by failing rear air vent seals behind the bumper
- ✓Ensure the diesel variants (if mainly used in town) have no AdBlue or DPF warnings
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