I know this subject is played out. I read through other threads on it and have gotten some good info. However, I want to know what the main cause of the EGR CEL code is? I got P1404 I think?? Anyway, the guy at autozone tole me it could be something electrical, or the EGR itself. I have seen numerous posts here on the site just saying it needs a good cleaning and to clean the EGR tube? Is this the tube leading to the bottom of the EGR from the exhaust? or some other tube? How hard are these things to clean, what needs to be cleaned as far as the EGR itself, and do you think these things will fix the code? I have also heard that other fouled equipment could cause the EGR code, such as O2 sensors, TPS, etc. What are your experiences? What do you think is the most logical/easiest/cheapest thing to try first? Also, how much performance loss am I looking at with the EGR malfunctioning? Is it even worth messing with? She seems to be running fine.Thank you ahead of time.