How to troubleshoot a BMW XM with a faulty engine?

I have been experiencing some issues with my BMW XM engine and I am not sure where to start troubleshooting. The check engine light is on and the car is running rough. What could be causing these issues and what steps should I take to diagnose and fix the problem?

First, check the error codes using a code reader or diagnostic tool. This will give you a starting point for troubleshooting.

Inspect the spark plugs for any fouling or damage. Replacing them if necessary.

Check the air filter to ensure it is clean. A dirty air filter can cause engine issues.