how do you fix failed emission codes 172 ,175 350clk 2009 Mercedes-benez

Question

How do you  dignose and fix failed emission codes 172 ,175 350clk 2009 Mercedes-benez

Answer 1

Hi there

These codes are both for a rich fuel mixture. There are a few things that can cause this, but since you have it on both banks, it leads to something that will affect both sides of the engine.

This could be incorrect fuel pressure, engine misfire or a bad mass air flow sensor. Each of these has to be tested and eliminated as the likely cause.