Easy : oil trap, PCV change
This was an easy job to do. It took me no more than 15 minutes. Remove the plastic thing covering the engine and there it is. Get the socket wrench, take out the several bolts that are easy to get to, disconnect one thing, take it off and replace. This solved the whistle sound with the engine running. It took an hour or so of driving for the check engine light to go off, but it did reset.
Reviewed by: Eric from St. Louis.