timing belt on 2003 Pontiac Vibe

What mileage should the timing belt be changed?

2 answers
I believe the Vibe has a timing chain, not a timing belt. So no need to worry, just maintain the vehicle properly and you'll never need to worry about replacing the timing chain.
I agree with bretbs answer. Was wondering if u meant drive belt. If so inspect for cracks or splits or if it makes noise definitly replace.