Q&A

 Master

When comparing prices make sure you are getting quoted for exactly the same work. I always suggest changing seals, water pump, tensioners ect... when doing a timing belt if replacing the timing belt on a car where the timing belt replacement is a very labor intensive operation. Say for example the timing belt change interval is "change belt every 100,000 miles". If you have 100,000 miles on the engine now you are expecting the oil seals and water pump to last until 200,000 miles. If the oil seal, idler bearings or water pump fail before that you must duplicate all the labor to replace a component that was axcessable during the initial labor operation, and of course cars never fail or break down at a convenient time or place. Of course economics come into play and a persons finances may not be able to cover such a comprehensive preventative maintainence.
The labor time to replace the belt alone is about 3.2 hours, water pump, seals ect each add additional cost.http://repairpal.com/estimator?car_type_id=2933

your looking at around $1200.00 for a new timing belt, water pump, and thermostat. At a Lexus Dealer with OEM parts which I recommend as it is something you dont want to keep replacing because of cheap aftermarket parts.