Question 1

DPF blockage from short journeys (A 180 d)

Accepted Answer

The diesel particulate filter on the A 180 d needs regular sustained runs at motorway speeds to regenerate. Cars used mainly for short urban trips light up the DPF warning, lose power and may go into limp mode; repeated interrupted regenerations also dilute the engine oil with diesel.

Question 2

Jerky 7G-DCT automatic gearbox (A-Class W176)

Accepted Answer

The 7G-DCT dual-clutch gearbox can shift roughly at low speed, hesitate when pulling away or jerk in traffic. Most cases improve with software updates and an adaptation; some need the control unit replaced.

Question 3

Big-end bearing wear on the 1.5 dCi (Renault-sourced diesel)

Accepted Answer

The 1.5 dCi (K9K) diesel used in the A-Class can wear its big-end bearings, especially with long service intervals or diluted oil. Warning signs are a knocking noise and low oil pressure; it can end in a spun bearing and engine failure.

Mercedes-Benz A-ClassA-Class W176

Known issues and common problems

Mercedes-Benz A-ClassA-Class W176

Known issues and common problems

DPF blockage from short journeys (A 180 d)1 solutionsMedium

Jerky 7G-DCT automatic gearbox (A-Class W176)1 solutionsMedium

Big-end bearing wear on the 1.5 dCi (Renault-sourced diesel)at 160000 km · 1 solutionsHigh