How do you read diagnostic codes on a 2005 Jaguar Vanden Plas?

To read diagnostic codes on a 2005 Jaguar Vanden Plas, you will need an OBD-II scanner. Connect the scanner to the OBD-II port, usually located under the dashboard near the driver's seat. Turn on the vehicle's ignition without starting the engine, then follow the scanner's prompts to retrieve the diagnostic trouble codes (DTCs). These codes can then be cross-referenced with a diagnostic manual or online resources to identify issues.