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P0177 code with no problems

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Old Nov 2, 2013 | 07:28 PM
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P0177 code with no problems

I have a Check Engine light on my 2007 CLK350 that shows as code P0177. O2 problem? No discernible performance problems. Any suggestions?
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Old Nov 2, 2013 | 11:14 PM
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Arer you sure it's P0177? I am not finding a cross reference for that generic OBDII code to the DTCs for ME 9.7
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Old Nov 3, 2013 | 08:29 AM
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The code reader actually read P2177 but the instruction book led me to believe I should drop the 2.
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Old Nov 4, 2013 | 10:23 PM
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I can't find a cross-reference from that generic OBDII "P" code to an MBZ DTC. I do find DTC 2177, which is "2177 The power supply at the input of the engine control unit has a sporadic malfunction. "
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Old Nov 5, 2013 | 11:05 AM
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P2177

I found another explanation for that code at Actron on-line. Not sure if it is correct for MBZ. "system too lean off idle bank 1". Not sure what that means either. Car seems to be running fine.
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Old Nov 5, 2013 | 10:22 PM
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If you clear the code, does the MIL illuminate again?
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Old Nov 6, 2013 | 07:26 AM
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Yes, it does.
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Old Nov 9, 2013 | 10:46 PM
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OK, that might correlate to these DTCs:

2089 The mixture in the right cylinder bank is too lean in the partial load range.
2091 The mixture in the right cylinder bank is too lean when idling.

Both of these suggest a problem with the pressure sensor (B28):

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Old Nov 10, 2013 | 09:50 AM
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Thanks, Rodney. I changed the air filters and cleared the code and this time it did not re-appear! Not sure if I jarred something as I changed the air filters or what but as of right now I am clear.
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