FIGURE THIS ONE????
Thread Starter
TECH Apprentice
Joined: Apr 2003
Posts: 315
Likes: 0
From: Katy, Tx
FIGURE THIS ONE???? PO171 FUEL TRIM BANK1 SYSTEM TO LEAN is what the Predator said the SES code is. The power enrichment was set at +.15% then +.05% and last to -.8% with the code being present again after each time. I only have a cutout, Magnaflow catback, TSP lid and Predator. Why does this code keep coming back, could I need a fuel filter after 15k miles 
. I haven't tried to erase it with Predator cause Im not sure if by ERASING it means never come back again or just for the one time the codes thrown. 
. I haven't tried to erase it with Predator cause Im not sure if by ERASING it means never come back again or just for the one time the codes thrown. 
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
Re: FIGURE THIS ONE???? check the front drivers side O2 sensor... I was having this code set on my car for a while... my LTRIMs were 2-5% drivers side and 15-20% passenger side...
My passenger side front O2 was messed up... put new O2 sensors in and it fixed it.. my problem was caused partially by an exhaust leak and also by running way too ruch for too long (several hundred miles running really rich after heads/cam install)
My passenger side front O2 was messed up... put new O2 sensors in and it fixed it.. my problem was caused partially by an exhaust leak and also by running way too ruch for too long (several hundred miles running really rich after heads/cam install)
