Check Engine light w/ error codes: P0170 & P0173

[tomw774]

My check engine light is on (2001 ML320) and the error codes P0170 & P0173 come up when I had them check it at Autozone. They couldn't cross reference them to the mercedes. Does anyone know what the problem could be? It seems to be running fine... Thanks!

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[mbenz80]

Your self adaptation reached limits.
P0170 - Self adaptation of the partial load or idle mixture formation for right cylinder bank to limit value of ME-SFI control module (N3/10)
P0173 - Same thing just for Left cylinder bank
Could be air leak, fuel injectors of diaphragm-type pressure regulating valve, wear to engine
I would suggest to check all four CO2 (oxygen) sensors or your air supply tube to throttle valve body came loose.

[dchew98@yahoo.com]

The same error code showed up on my 1998 C230 too. Rather than trying to figure out the problem(s) as suggested in the other posts on this forum (which I did and ended up wasting a lot of time) my advice is to bring it to a mechanic with the Mercedes Benz STAR diagnostic scanner (basically a laptop) and it will tell you exactly what the problem is.

In my case, it was the MAF. So I bought one from autohauz (https://www.autohausaz.com/search/pr...ber=0280217114) and was able to replace it myself.