Ok so i start my car up and my ltft are at -50 for bank 2 i nstantly think wtf. I reset fuel trims every thing goes to 0 but bank 2 ltft stay at -50. I drive around some my stft are working fine for both banks. Both o2s are switching so what gives why wont the ltft move for bank 2?

 

Sounds like a bad o2

 

Didnt think that o2s would still switch and read if it was that bad but i will switch the sensors and see what happens.

 

OK well a little up date i swithced the O2 sensors around and nothing. However i did forget that its the histogram that reads -50. LTFT bank 2 says -100 . any ideads guys im beging to think computer either mine or the cars going to check to make sure that my hpt still works on another car.

 

well it turns out i was loging to many pids in hpt and that caused my fuel trims to show up as -100. Thanks to Gillbot for pointing out the obvius to me

 

 

I have the same problem, can anyone define what number is too many PID's

 

theres no set #...98's have a max of 24bytes of info via hptuners at least...that could be 12 pid's it could be 24 pid's...it all depends on the pid's being used.