how to fix code p0401

Question

replace egr valve and air mass sensor same code p0401

Answer 1

HI there

Usually the issue is with a plugged or blocked egr port. However there can also be issues with the sensors to let you know the egr is working. Here is a list of possible causes for the code.

P0401 MERCEDES-BENZ - Exhaust Gas Recirculation Flow Insufficient Detected

Read more: https://www.autocodes.com/p0401_mercedes-benz.html