How do I reset the check engine light on a 2001 jaguar xj8?

To reset the check engine light on a 2001 Jaguar XJ8, you can try disconnecting the battery. Remove the negative terminal and leave it disconnected for about 15-30 minutes. Reconnect the terminal, and the light should reset. Alternatively, you can use an OBD-II scanner to clear the trouble codes that triggered the light.