Tgkaotic

Hi,
Before I begin, I want everyone to know how much help acurazine has been with my 2000 TL!! Thanks in advance for looking!

Now, My TL started throwing the code P0170 & P0171 about 3 weeks ago on and off..
So I checked all the Vacuum lines and check the O2 sensor and find the o2 sensor out of range.
I changed the J pipe(flrex was ripped) and the front o2 sensor and I am still getting the p0170 and pending p0171?
I have reset the ECM and still pops back up any suggestions?
I have also ran SeaFoam thru the gas 2 cans w full tanks of 93!
Thanks again
TG

closetprisoner

I'm guessing on IAT or Fuel pressure regulator

3.2TLc

Hey Tgkaotic, when replaciing the Primary O2 sensor.....did ya use an OEM brand sensor ? The originals seem to work more effectively than some of the cheaper aftermarket ones.

As Closetprisoner suggested.....check the fuel pressure. There could possibly be a restriction within the fuel delivery system, causing the P0171 code for the fuel system being too lean.

Tgkaotic

Hi guys,
I will check the fuel pressure this weekend if the snow does not come and I did use the denso oem o2 sensor.
IAT I will see and maybe clean it.
The p0170 is the main code that keeps popping up tho! any more suggestions?
I have the service manual so I will look up the fuel pressure before I test it and follow the porcudure.
Thanks again,
TG