Is there a fuse protecting on board diagnostic port on 2002 Jeep Liberty?

Yes, the 2002 Jeep Liberty does have a fuse that protects the onboard diagnostic (OBD) port. This fuse is typically part of the vehicle's fuse box, which helps safeguard the electrical components associated with the OBD system. If you're experiencing issues with the OBD port, checking the relevant fuse for continuity is a good troubleshooting step. Always refer to the owner's manual for the specific fuse location and rating.