Do not put any parts into until you get the code read and find out what is going on.
If you just start throwing parts at it, you could be wasting money.
Put the belt back on get the code read and at the same time observe all the other engine functions on teh scanner or have someone else do it. This car needs a trained technician, not an auto zone free scan, or else the issue(s) could stay. You should possibly take it to the dealer to at least figure out what is wrong and THEN fix it on your own.