my timing belt is broken, do i need to change my engine?

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. So sorry to hear you're having trouble with your RX330. A timing belt snapping with no warning is pretty common, as the belt is not easily visible for inspection. A broken timing belt can be a serious issue, but whether or not you need a new engine depends on your vehicle's engine type. Technically, the engine in your car is an interference design, meaning that a broken timing belt could cause internal engine damage. That said, it is very common that the 3MZ-FE engine does not sustain internal damage when a timing belt breaks. So, it's very possible that replacing the timing belt could get your car running again. I recommend getting a second opinion from another mechanic to confirm. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!