Well, our '04 just popped a code P406 from the check engine light. Autozone says its a EGR issue. Anyone run into this?

 

If i am not mistaken it is EGR Position Sensor Circuit High Input Conditions

EGR sensor problem
signal is shortned
ground circuit is open
signal circuit is open
or is damaged
or solenoid failure

Or PCM failure

I got this from CHILTON DIAGNOSTIC SERVICE 2006 edition
I hope this is helpful