auturner

P0420 - catalyst system efficiency below threshold bank . this code is whats showing up now. got rid of the p0301. do i need to replace the catalytic converter? or is there any sensors or anything i can check or replace first? i have a obdii reader with live datastreaming but i am not mechanically inclined enough to look at the data streaming to be able to pin point what exact type of issue im having.  

okay, ill check the pcm. in the meantime i changed fuel injector and pcv valve. and im still getting the p0301 code. thanks

2011 edge sel 129xxx miles. Drove it through some water in mississippi a month ago, since then im getting p0301 code- misfire on cylinder 1. changed coil and plugs. light went away for a few hours then came back flashing. drove it through 3 feet of water. no water in oil.