Question 1

What is 7G-DCT Gearbox Judder on the Mercedes-Benz Mercedes-Benz B-Class (W246)?

Accepted Answer

The dual-clutch automatic can become hesitant or jerky if clutch wear is present or fluid changes have been skipped.

Question 2

What is OM651 Diesel Timing Chain Tensioner Oil Leak on the Mercedes-Benz Mercedes-Benz B-Class (W246)?

Accepted Answer

The 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.

Question 3

What is Water ingress in boot from rear air vent seals on the Mercedes-Benz Mercedes-Benz B-Class (W246)?

Accepted Answer

The 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.

Question 4

What should I check when buying a used Mercedes-Benz Mercedes-Benz B-Class (W246)?

Accepted Answer

Check the 7G-DCT gearbox for juddering in stop-start traffic; fluid changes every 3 years/31,000 miles are vital

Question 5

What should I check when buying a used Mercedes-Benz Mercedes-Benz B-Class (W246)?

Accepted Answer

Look out for water ingress in the boot, often caused by failing rear air vent seals behind the bumper

Question 6

What should I check when buying a used Mercedes-Benz Mercedes-Benz B-Class (W246)?

Accepted Answer

Ensure the diesel variants (if mainly used in town) have no AdBlue or DPF warnings

Question 7

What years was the Mercedes-Benz Mercedes-Benz B-Class (W246) made?

Accepted Answer

The Mercedes-Benz Mercedes-Benz B-Class (W246) was produced from 2011 to 2018.

Mercedes-Benz Mercedes-Benz B-Class (W246)

Mercedes-Benz B-Class (W246) Reliability & Common Faults

Browse by Production Year