How do you clear the check engine light on a 2000 XJ8?

To clear the check engine light on a 2000 Jaguar XJ8, you can use an OBD-II scanner to read the trouble codes and then clear them. Simply connect the scanner to the OBD-II port, retrieve the codes, and use the option to erase or clear them. Alternatively, you can disconnect the vehicle's battery for about 15 minutes to reset the engine control module, which may also turn off the check engine light. However, make sure to address any underlying issues that triggered the light to avoid it coming back on.