Normally a timing chain will last the life of the engine and is replaced during a complete engine rebuild. No maintenance is normally required.
Timing chain
It must have a timing CHAIN ( The Gates website does not list a timing belt for the 1.5 liter , 4 cylinder engine in a 2005 Scion XB )
No, it has a timing chain.
Timing chain.
Nope! Chain!
No t-belt on that puppy. Internal Timing Chain.
All 2AZ-FE engines uses timing chains
its a chain, and a non-interference (free spinning) engine. which means, in case of a timing chain failure, the valves will clear the pistons and there will be no engine damage
Since 2002 almost all toyota vehicles have been equipped with Timing Chains, they are much more reliable, dependable and almost maintenance free. The timing chain should last the life of the car with proper oil levels.
I know the 1st generation xB's (04-06) have the 1.5L 1NZ-FE Toyota engines and use a timing chain. I'm not sure about the engines on the second generation.
It will last the life of the engine and is changed during a complete engine overhaul.
being chain driven you dont have any replacement schedule so you only need to replace it if it snaps which the car should be in a state for unreasonable repair on it due to condition and age