ok guys lets work this prob , well i have the full obx system and i didnt run into any probs till last week engine light came on , well since i work at a shop i have a Computers to do the work for me :twisted: well anyways i gots a P0422 error and the list of probs that cuases that is Catalytic converter deteriorated , Heated oxygen sensor failed, Engine contorl module failed , , anyways guys im thinking it cant be the CAT i dont have one , also the light came back on after i cleared it duhhh , but im thinking the O2 is picking this up to much heat and flow at once and it doesnt like it, but not listing any O2's being bad i mean the O2 is doing its job , i guess im askin anyone else run into this or know where i can get a high performace O2 ir a high heat O2 it be great , any other shop guys or anyone out there hit me up , i need to work this prob .

 

well if you dont have a cat then that is your problem. i dont have a cat either and my cel stays on also.

there is an o2 before the cat and one after the cat. the one after the cat is to make sure the cat is doing its job.

so the o2's are working but since you dont have a cat then the o2 is tripping the code telling the ecu that the cat is not working because it is'nt working, there is'nt a cat.

 

Well i have a 2001 and the only 2 we have is 2 in front of the cat one on the headers and one right before the cat , i have a free flow cat so . i dont know how anyother model is where the O2's is sitting

 

i have the same as you, when it was in stock form and the cat was bolted to the exhaust manifold, i had one o2 sensor above the cat and one right below it.

if you put on obx headers, did you put in the 2nd bung for the o2 sensor?

but you said you didnt have a cat so that would be the problem.

if it was the o2 sensor you would notice a power loss.

 

well i jsut pmed u with my AIM s/n that way we dont waste fourm room

 

well i know what u talking about one right before and after thats right in frt than we have another one after all that well i have that replaced as well with a free flow cat/ replacement cat, and both O2 sensors are put in i wouldnt just put a bung in them lol

cuz o nthe stock it kinda goes headers ,O2 sensor , cat/ semi down pipe, O2 sensor , cat , and the rest of the piping let me know if im wrong i dont member the stock setup i didnt have it on very long

but the obx i have goes header, O2 sensor on #4 pipe of the headers , downpipe , O2 sensor , replacement cat , and than cat back