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It takes a few days for the PCM (powertrain control module) to reset itself. It is only normal for this to happen when you disconnect the battery and replace anold worn out part with a new part. Not to worry it just takes a little while for everything to correct itself. Hope this will help you.
IT IS LOCATED ON THE FRONT OF THE FRONT CYLINDER HEAD(BELT END) OF ENGINE..JUST ABOVE ALTERNATOR..2 BOLTS HOLD IT TO HEAD,A METAL TUBE COMES OFF IT..1 ELECTRICAL CONNECTOR..MORE LIKELY ELECTRICAL SIDE OF VALVE IS DEFECTIVE(SOLENOID)
..RECOMMEND REPLACING VALVE..ABOUT 120 BUCKS FROM DEALER..YOU WILL NEED A NEW TUBE GASKET AND NEED TO DISCONNECT BATTERY WHILE REPLACING..HAVE SEEN CODES RETURN EVEN REPLACING A DEFECTIVE VALVE..WAS A TECH TIP FROM CHRYSLER ENGINEERING..I HOPE THIS HELPS
P406 is a EGR code, EGR will also cause a knocking/ pinging sound when there bad. Very common problem. The position sensor inside the valve goes bad. Your going to have to replace the whole EGR valve and it can put out variety of codes from P0401 to P0406. The new valve will solve the problem and easy to replace, you can pick one up at Auto Zone and they can give you the step by step instructions to replacing the EGR with common tools. Good luck and hope this helps.
This is how I do it, maybe it will work for you too. Remove the top bolt. Using a prybar, roll the egr backwards towards the engine. This roll is also in the direction the bottom bolt has to turn to come out. From the new angle you can use a wrench or 1/4 drive wobble on it. When it gets back to the point you can't get the wrench on it, use needlenose pliers on the threaded end to finish the removal. Going back is a little tricky, start the bottom bolt and run it in almost all the way and then roll the egr forward to start the top bolt. Tighten the bottom the best you can first. Tighten the top bolt last, this puts more pressure against the bottom bolt making it tighter. Otherwise you have to remove the alternator.
if it is a 2004 the 3 yr 36000 mile warranty has probably expired. i assume it has a 2.4L the egr is on the drivers side rear part of the head...if memory serves me correctl the valve is about $125 plus and hour of labor