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2004 Mercury Monterey Question: Vince



vinco54, Centre, AL, June 28, 2011, 18:36

The fault that is coming up is lean bank 1 and 2 fault. I have had the fuel filter and the drive shaft positioning sensor replaced. When driving the van at times the RPM will fall below 100 and it idols real rough.

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  • Answer #1

    June 28, 2011, 22:41

    I am not Vince but I have repaired many 'lean bank 1 and 2' codes i.e P0171 and P0174. Here is a lean fuel trim code diagnostic article that I wrote for RepairPal that goes over a step by step inspection procedure for these codes.

    http://repairpal.com/OBD-II-Code-P0171-and-P0174 many people have had success with these inspections --> good luck !

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  • Answer #2

    January 24, 2012, 10:17

    You might want to check for a vacuum leak. I had the same codes on mine and after changing the O2 sensor the code changed to another sensor. that is when I noticed the PCV hose had a nickel size hole in it at the rubber bend.

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