Agreed, to an extent. Im not gonna argue, because theres several reasons as to why a cat would fail, including normal deterioration. My original statement was replacing a rear o2 sensor would not fix the code because its a catalyst efficiency code, no fault of the sensor, since its located behind the catalytic converter.

 

I've been on here for too long, go ahead and argue all you want, P0430 has been

It's a unicorn, we will never know....

 

Haha, I'm not here to argue...just sayin