Check Engine light w/ error codes: P0170 & P0173 - Mercedes Forum - Mercedes Benz Enthusiast Forums

Mercedes M Class Mercedes ML350 and Mercedes ML500 SUV's.

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Old 06-28-2009, 12:51 PM
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Default Check Engine light w/ error codes: P0170 & P0173

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...

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Old 06-28-2009, 01:38 PM
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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.
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Old 06-28-2009, 03:15 PM
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Default Check Engine light w/ error codes: P0170 & P0173

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 ( and was able to replace it myself.
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