Originally Posted by WRXMANDO
I running stage 2, but I'm still getting P0420.
Thats the catylist effeciency below threshold CEL. How long have you had the CEL? If its only been for a short while give it some more time. It should eventually remove itself. If not you may have one of the 1 in 50 cars Cobb has mentioned that the AccessECu reflash will not remove that CEL on. You would need the P0420 CEL fix to remove it.