Where is the radio anti theft code for 1990 Porsche 911?

The radio anti-theft code for a 1990 Porsche 911 is typically found in the owner's manual or on a card that was provided with the vehicle. If you can't locate it there, you may need to contact a Porsche dealership with your vehicle's identification number (VIN) for assistance. Additionally, some radio units may display the code on their screens if they are powered on and locked.