Are you seeing this code on a like an F-150 or an Expedition, and do both mirrors fail to heat or just one? Shop Ford Parts Online - Genuine OEM Parts
The ":60" suffix in Ford's diagnostic system typically indicates an "event information" or "signal calculation failure," often pointing toward an electrical circuit that the Body Control Module (BCM) or door module cannot complete. What Does DTC B166A:60 Mean? ford b166a60