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P0172 Diagnostic Trouble Code Discussion for August 2007

Fuel System Rich (Bank 1)

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Trouble Ticket Help Requests for DTC P0172
Help Request Posted
1999 Toyota 4Runner Limited 3.4L Hesitation, MIL Lamp on VIN: JT3HN87R9X
P0172: Fuel System Too Rich (Bank 1). I have two of these [...] doing just about the same thing. This one keeps throwing po172. I have replace b1s1 a/f sensor reading are about .64 at cruising speed. I have cleaned the maf and my ltft has come down to -21.9 from -35. I am not really sure on how th...
August 07, 2007
2002 Ford Explorer XLS 4.0L Misfire, MIL Lamp on VIN: 1FMZU72K22
P0172: Bank rich. This truck missfires especially under hard load. It will at times miss at light cruise. The long term fuel trim for both banks is -25%. STFT is -8 to -12%. Both front o2 sensors seem to be switching fine. The truck was origianlly brought in for trans shifting ...
August 30, 2007