Code p0420
Hi, I have a 2004 used Mitsubishi endeavor
and my check engine light goes off an on it
reads p0420 for my catalyst converter... I
wanted to know what should i do... Should I
replace the cat or the sensor or get a tune
up and see what happens..
I really don't know much about cars it drives
fine rough idle sometimes and when I start
it up it revs up pretty hard until it warms up
then it's silent