1. On the driver's side door pillar, near the bottom of the door. It is usually etched into a metal plate.
2. On the firewall of the engine bay, near the battery. It is also usually etched into a metal plate.
The chassis number is a unique identifier for your vehicle and is used for registration and identification purposes. It is important to keep a record of your chassis number in case you ever need to provide it to the authorities or a mechanic.