Ok, I have an 04 Gt, Steen Stage 2 Heads, Comp 270 Cams, Long tube, all bolt ons etc..the check engine light is on and reads lean bank 02 sensor I replaced both front o2 sensors with Ford o2 sensors reset the computer and after a 10 mile trip down the road I have the same code again

things I have done

had the retuned

Again replace both o2 sensors

sprayed ether evey were looking for vacuum leak

checked for exhaust leak prior to the o2 sensor

My next shot is checking the harness with a multimeter for continuity to make sure there is no break in the wires

if any body knows what voltage or resistance reading I should get that would be helpful too

any other ideas to check would be great too

thanks

 

I had rich on bank 02 and it turned out to be that the adjustable FPR was set too high. I think you have a returnless fuel system so this may not apply. Did you every get a tune? If not get one if yes bring it back.

 

Yeah we just tuned it yesturday, but it was like this before it showed on the computer the o2 opening and closing, it was intermitten. when driving the car it does the same thing sometimes it will stall ( I take it that is when the o2 tells the computer it needs more fuel) but what is causing this I can not figure out