Step 1: Locate the diagnostic connector under the dash, usually near the steering column.
Step 2: Check for a plastic cover protecting the diagnostic connector and remove it.
Step 3: Connect a diagnostic code reader to the connector and turn on the ignition (not starting the engine).
Step 4: After a few moments, the code reader should retrieve and display any stored diagnostic trouble codes.
Step 5: Use a code reader to decode the retrieved codes and determine the potential issues or malfunctions with the vehicle. It's recommended to consult a repair manual or seek assistance from a qualified automotive technician to further diagnose and address the indicated problems.