Hey Guys,

I could use some help. I have an 05 WRX Wagon modded with a Cobb Accessport and snorkus delete. Every once in a while I get a CEL (which usually goes off after a day or two of being on), and when I use my Accessport to read it, the error code says that "the rear o2 sensor is reading slowly." I've done a lot of searching on the forums, but haven't really had any luck determining what the problem is. Do you think this is a busted O2 sensor? Should I bring it to the dealer to have the o2 sensor replaced? I just got the car in late November... Any help or suggestions would be very much appreciated.