If you're the original owner, don't do the water pump as suggested by
Edwin. It's covered 10 years/100k by the powertrain warranty. If it
fails after the warranty is up, the belt will have been on the car long
enough to be close to justifing another replacement on that count alone (4
years/60k miles, whichever comes first).
Do not replace the tensioner. Some vehicles have a hydraulic tensioner
which can fail silently. Your tensioner is a pulley on an eccentric.
I've never seen a 2.0 tensioner pulley fail. If it does start to have a
problem, you'll hear it.
Drive belts must be removed to replace the timing belt. Replace them if
cracking. If not, consider it if they have 30k or more on them. You
shouldn't need to pay any additional labor for this, just the price of the
parts.
Cost varies greatly by type of shop, brand of parts, and geographic area.
Get quotes from places near you to get a good idea. If using an
aftermarket belt, use a brand of excellent reputation only.
Engine is indeed interference.
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