Clearing Fault Codes
WARNING: This page is about a different car, the 2002 Ford Windstar. However, it is still accessible from the selected car via links, so may be relevant.
Connect scan tool to Data Link Connector (DLC), located under instrument panel. Follow scan tool manufacturer's instructions to clear codes. The scan tool will retrieve DTCs again after clearing DTCs, and if any remain they will be displayed. Hard DTCs will be re-displayed after clearing DTCs since they cannot be cleared from RCM memory.