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P0172 Diagnostic Trouble Code Discussion for April 2011

Fuel System Rich (Bank 1)

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Trouble Ticket Help Requests for DTC P0172
Help Request Posted
2000 Toyota Tacoma SR5 3.4L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 41AWN72N0Y
P0172: Fuel System Too Rich (Bank 1). customer concern was lack of power and hesitates,i could not road test it would barely run,it would back fire through the throttle body, checked cam and crank timing all marks are in time.checked for external vacuum leaks with propane no leaks found.truck ran ...
April 08, 2011
1998 Buick Century Limited 3.1L MIL Lamp on VIN: 2G2WY52M9W
P0172: Fuel System Rich. Car came in with below codes, checked scan data and fuel trims -25% to -30%. Checked usual fuel pressure regulator-ok, pulled PCV and plugged. Still high. Then found in scan data that purge valve was at 20%. I unplugged purge valve connector and fuel trims cam...
April 25, 2011
2006 Ford F-250 Super Duty XL 5.4L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1FTSX21506
P0172: rich b1. This vehicle came in running rough with these codes.Figured few coils would fix 3&4. Thought had ticking noise on #1 bank. Pulled valve cover looking for broken valve spring and all is good with good compression. Truck misses instantly on start up, pops cy...
April 25, 2011
2004 Suzuki Verona LX 2.5L Hesitation, MIL Lamp on VIN: KL5VM52CX4
P0172: Fuel System Too Rich (Bank 1). ... into our shop with P0175 and p0172 rich bank one and two. I replaced the MAF and the pcv valve about a month ago. I dont have a scan tool that will get into this thing at all, which is really weird considering we have alot of scantools. My Alldata seems to...
April 27, 2011