When to change timing chain for a 2007 Toyota Sienna?

The timing chain on a 2007 Toyota Sienna is designed to last the lifetime of the engine, typically around 100,000 to 150,000 miles. However, it’s important to monitor for signs of wear, such as unusual engine noises, rough idling, or check engine lights related to timing issues. If any of these symptoms occur or you notice a significant decrease in performance, it's advisable to have the timing chain inspected and replaced if necessary. Regular maintenance checks can help ensure the timing chain remains in good condition.