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Old 03-27-2018, 10:14 AM   #1
Scooby Newbie
Member#: 480215
Join Date: Jan 2018
Default P0457 & P0171

2007 Subaru STi, Throwing two codes that I cannot figure out!
P0171 - System Too Lean ( Extreme Fuel Trims )
P0457 - Evap System Leak Detected ( Fuel Cap Loose/Off )

I replaced fuel cap, didnít get rid of CEL or code.

The car doesnít seem to be running lean at all. Runs fine honestly. The code isnít always thrown and the CEL isnt always on. Iíll clear it and maybe a day or two later it will come back on. Clear it couple days no CEL and then it comes back on.

Also if I fill up with gas, then go to start my car, I have to crank it and push the pedal a little bit and hold it steady at like 1500 for 10-15 seconds or the car will die on me. After that the car is perfectly fine. Turns on and off and runs just as should. Only when I fill the car up with gas. I use 91, no bad gas or anything. Iím lost on where to go next. Any Subaru Gods out there to help guide me?
Thinking Gasket on fuel pump assembly maybe? Or a Clogged Evap Line?? Iím not sure.
Please and thanks for your time and response!!
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Old 04-18-2018, 02:31 AM   #2
Scooby Specialist
Member#: 99455
Join Date: Oct 2005
Chapter/Region: NWIC
Location: Eugene Oregon
2002 WRX Sedan


I'm looking for a solution to my P0457 situation as well. 2006 Saabaru Aero, and I keep getting this code. Car runs great and the cap is not loose (it's even been replaced).

The real annouance is that whenever the CEL comes on, I lose cruise control as well. Thd cruise flashes repeatedly until I clear the code.

Would love to hear if you solve this.
MegaZac is offline   Reply With Quote

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