The service engine light came on in your 2001 range rover with an OBD code p0455 one of the options was about gas cap which wasnt straight but is now thelight still should you reset it if so?

Yes, you should reset the service engine light after fixing the issue that caused it to come on. Resetting the light will clear the code from the vehicle's computer and allow it to start monitoring for new issues again. You can usually reset the light by disconnecting the battery for a few minutes or by using a scan tool.

Here are the steps to reset the service engine light on a 2001 Range Rover:

1. Turn off the ignition.

2. Disconnect the negative battery terminal.

3. Wait for 30 seconds.

4. Reconnect the negative battery terminal.

5. Turn on the ignition.

6. The service engine light should now be reset.

If the service engine light does not reset, you may need to have the vehicle scanned by a qualified technician to identify and fix the underlying issue.