2004 Chrysler Pacifica 3.5L
Purchased from auction (ima dealer) had a new egr installed when purcahsed. Had an EGR circuit code so we removed egr and intake cleaned everything up and code still wouldnt clear. Took for diag they said the PCM was bad. So replaced PCM and its still throwing the same code. Any ideas guys? This is a real headache

 

A real headache, that's an understatement. Curious to what the solution turns out to be, so I will be keeping an eye on this.

 

so I have a 04’ Chrysler Pacifica AWD with the code P0406 (EGR Sensor and Valve Gasket) but then under my secondary codes it popped a p0456 (Evap System Small Leak) and a P0325 (Knock Sensor 1 Circuit)
but then I tested it again and then P0325 was the main, and the P0406 was secondary.
I was told that if I replace the Knock Sensor , it may delete the EGR sensor or vice versa.

 

No they have nothing to do with each other they are separate circuits along with systems the engine uses.