Ok, so I went and had the code read and it came up at 0420. Didnt say what sensor it was just said bank 1. Then catalyst lower then recommended. Hope that makes sense. Is that mean that it is the second sensor? I do have the Two plugs in there that are drilled out. One is drilled the other isnt. Should I drill the second one out too?

 

No..only drill one out. Are you using the shorter or longer antifoulers?

 

Yes that means it's the second 02 throwing the code.

 

Im using the longer ones I believe. they stick out along ways it seems like. Those are the right ones I do believe someone saying, maybe not.

 

p0420 means bad catalitic converter if you run a header thats the code

 

yeah I got that part, Im trying to get past that code.. I am using the antifoulers and they are not working.

 

you are one of the unlucky tC owner.....

have you tried, 3 of them? that would be interesting...

 

There isnt room under there to try three, plus I dont think it would help..

 

Make sure the 02 sensor is screwed into the one that is drilled out and the one drilled out is screwed into the one that is normal. The normal one (with everything behind it) screws into the S-Pipe. These need to be 18mm in size.

When I did mine, I made sure I drilled the 1/2" hole out completely. There was a point I could have stopped and looked good, but I finished it off with a 1/2" step bit making sure it was a complete 1/2" hole all the way thru.

Other than that, not sure what it could be.

 

Test to see if your O2 sensor is bad. Check my thread:
https://www.scionlife.com/forums/viewtopic.php?t=89781

 

that is what I did on mine also ScionDad.. Im gonna keep messing with the voltages of this peice and figure out where it needs to be and make my own resistor pack for it. Tell you what though. When the CEL isnt on the A/F gauge seems to work alot better and the car seems more responsive and a little quicker.