Hi everyone.

While driving around town the other day I got the following codes: p0441 p0421 p0431. Cleared the codes and they came back this morning.

i got a Fabspeed X pipe installed about 100 miles ago. Also running a Fabspeed intake. Is this related? 2011 C4S with 100k miles.

 

i will add drivability does not seem to be affected.

 

Which version of x-pipe did you go with - 100 cell or 200 cell. I've had no issues with my 200 cell one and not using any O2 spacers 100 cell ones are known to throw codes - says so on their website I believe. If you have the 200 cell ones and are still getting codes, O2 spacers might solve it