[PTek Will]

Hey Guys,

I had AR catless downpipes, jb4 iso5, injen dci to remove before I go into the dealership to try to get a warranty for wastegate rattle. So tonight I took out the AR dps and put in my stocks. I fired her up and WTF it sounds like I have a straight pipe. This sounds ridiculously loud!!! I thought maybe they were leaking somewhere, but i crawled underneath to feel for any exhaust leaks and I didn't feel anything. So I test drove it around to see if it was ok to drive and it seemed fine. I come back and check the codes:

P0171: System too lean (Bank1) [im assuming bank 1 is the first 3 cylinders]
P0420: Catalyst Efficiency Below Threshold (Bank 1)
P0430: Catalyst Efficiency Below Threshold (Bank 2)

Now I still have the JB4 in and the intake in, but this shouldn't really matter... should it?

I don't think I will be taking the car to work tomorrow. Any ideas what could be wrong? I read I could have bad O2 sensors, but could bad O2 sensors make my car sound like I removed my catback?

Help me out guys! I got until Monday to sort this out D: Thanks in advance!!

[ef11]

For starters I would put the car completely back to stock and remove the JB4 and intake. But I can understand your reasoning that it shouldn't make the car sound terrible with the JB4 still installed.

HOWEVER, I think the computer does somewhat learn the car and what you have on it, so it might just not be used to having the cats so things are messing up...interested to see what the issue is.

[PTek Will]

lol i forgot to put bank 1 o2 sensor back in hahaha *blonde moment*

[ef11]

Yeah I was thinking it might be something with an o2 sensor