CEL after Catback install, what could be the cause?

[dc2teggy2011]

Lol. It's not bad.. We don't have emissions down here. I live in middle GA, it don't even matter. lol. I'm prolly gonna put a nice high flow on it eventually though, whenever I have the money to spare. Being a broke college girl sucks sometimes.

 

[NemesisCBR]

If you have obd2 only the primary sensor will affect anything. If its rich it has nothing to do with the cat unless its clogged which could cause problems of its own. Primary o2 reads before the cat.

Seems the car fixed itself. Maybe the ecu just needed some time to recalculate the new ratios? I've driven it hard on several occasions now without a single CEL.

Ecu adjust for about 10% in part throttle only (if I recall). It's possible but if it went away just wait til it comes back.