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Old 06-28-2009, 12:51 PM
Junior Member
2001 Mercedes-Benz M-Class
Join Date: Jun 2009
Posts: 9
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
mbenz80's Avatar
Senior Member
Join Date: Jan 2005
Location: USA Chicago
Posts: 429

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.
1999 ML320 230K miles
2003 Lexus GX470 285K miles
2001 ML320 162K miles
1980 280SE EURO W126 156K miles 142mph top speed SOLD
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Old 06-28-2009, 03:15 PM
Junior Member
Join Date: Jun 2009
Posts: 1
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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Old 06-28-2009, 03:15 PM

2001, 320, benz, check, clk, code, codes, determining, engine, error, light, mbz, mercedes, messages, ml320, p0170, p0173

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