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P0172 Diagnostic Trouble Code Discussion for November 2004

Fuel System Rich (Bank 1)

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Trouble Ticket Help Requests for DTC P0172
Help Request Posted
1998 Pontiac Trans Sport Montana 3.4L MIL Lamp on VIN: 1GMDU03E1W
P0172: Fuel Trim System Rich (Bank 1). Customer complaint SES light on runs ok. Latest PCM calibration, does not require update. At idle in closed loop long term fuel trim -21%. This is a long time customer (bosses father) buys his fuel here. I am out of ideas I sure hope someone has ran into this....
November 19, 2004