I saw on another forum a person that has a check engine light coming on in a 00' ram. They say it's been taken to the dealer and the computer says its the transmission sensor. I guess it's been replaced twice and it comes back on 3-4 days later and stays on. I was thinking maybe it was the O2 sensor since those go out alot. They are going to try that, but do you guys have any other ideas what it could be?