Seeing that it's over 10 years old, and probably has over 100k miles on the clock, it's actually pretty likely it's bad.

I think you can get a new one in the aftermarket, besides sourcing one at the dealer.

I probably changed 2 or 3 a month at the dealership.

Probably a good idea to install a new timing cover seal if you have to change it, it comes out without removing the cover.