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P2179 Diagnostic Trouble Code Discussion for August 2012

Fuel Trim System Lean At Cruise Or Acceleration (Bank 2)

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Trouble Ticket Help Requests for DTC P2179
Help Request Posted
2005 Mazda MPV ES 3.0L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: JM3LW28A65
P2179: Fuel System Too Lean At Off Idle (Bank 2). initally i thought this was going to be fairly painless vacuum leak, MAF, so on and so forth and it may be but im having trouble finding a place to start because all the HO2S voltage is at 0.01 all four of them but at the same time STFT is at -128. so why woul...
August 02, 2012
2004 Volvo S80 2.9 2.9L MIL Lamp on VIN: YV1TS92DX4
P2179: System too lean off idle bank 2. Vehicle came in wil CEL on. Scanned and found lean codes stored. Tested MAF and it had intermittant drops. Replaced MAF. Customer came back 250 miles later with CEL on again and the same codes stored. Smoke tested intake, exhaust and pcv system. No leaks found...
August 13, 2012