Hi guys! I need help with my stang, i own a 2002 mustang V6 manual trans with flowmaster dual exhaust. The SES light is on, so i came to autozone and they read the code P0401, i read that is a common fault in our cars and most of the time is the DPFE sensor, is that correct? is there something that you would recommend to check/clean before buying any parts?I would also like to know where to buy parts if necesary. I would appreciate any advice. Raul R.