How do you repair a 1996 Jaguar XJ6 that just turns over but will not start?

To troubleshoot a 1996 Jaguar XJ6 that turns over but won't start, first check the battery and starter to ensure they're functioning properly. Next, inspect the fuel system for issues, such as a clogged fuel filter or a faulty fuel pump, and verify that there's adequate fuel pressure. Additionally, examine the ignition system for spark by testing the ignition coils and checking the condition of the spark plugs. If these components are in working order, consider scanning for diagnostic trouble codes, as they can provide further insights into potential issues.