So I just got my car up and running after a complete rebuild of the engine. I bought the car torn apart. The car (90 TT) seems to run very well but I pulled the codes and it comes up with 35, and 53 o2 sensor problem I guess. 42 shows up too but I am guessing that is because I removed the prvr's. I am ready to tune my boost controller for more boost(profec b 2) just want to know if there is a problem and maybe how to fix/diagnose it or if it is normal with my mods THANKS.

Mods include:
JWT ecu
full turbo back hks exhaust
blitz bov's
aiv delete
egr delete
prvr delete
tb coolant bypass
electric fan

Almost certainly not problem related:
ur crank pulley
alluminum flywheel
upgraded clutch
greddy b spec 2
apexi tt
greddy oil cooler
z1 boost hoses
stillen wheels
upgraded brakes

Any suggestions would be greatly appreciated as i am very new to these cars,not ignorant just trying to get some good advice from someone who knows about these cars or has had similar issues. THANKS

 

kind of a long shot but you might try replacing the O2 sensors.

if you want to confirm, there is a separate diagnostic mode just for the O2 sensors that can be found in the online FSM

 

Thanks for the reply. I will try running the diagnostic. I wasn't sure if the o2 sensors are a common problem with these or a result of something else. I hate to just throw parts at something.

 

O2 sensors do just go out. the only other possibility that comes to mind is that the connections could be bad.

fyi, if they both went out at once, it's possible bad gas or something could have done it. i took a vacation in the outer banks a few years back and the gas down there instantly ruined the O2 sensors on my truck that was only a few years old.