I HAVE CODE PO447 on 2002 Dodge Intrepid

I REPLLACD THE GAS CAP AND EVP VALVE STILL CODE CAME BACK

2 answers
seek diag and est could be several other issues. we would just be guessing like u are
I had the same problem. For some reason it tells me to replace an 02 sensor every year also. A friend of mine has a cable to hook up to my car and reset the code and it worked. but it did take a day or 2 to go away. Not sure why it was showing up.