resparking up this old thread because i still havent fixed my car... i took it to autozone a few months ago and got it checked out... the codes i got were:

P0420
P0401

i attached the printouts

if i were to remove my egr valve, do i need to take any certain precautions before i clean it? what should i use to clean it? and for the 0420 code, should i just buy an O2 sensor?

thanks for the help