Why do your 4x4 high and 4x4 low light flash at the same time on your 2005 ford expedition?

If the 4x4 high and 4x4 low lights are flashing simultaneously on your 2005 Ford Expedition, it typically indicates a problem with the four-wheel drive system. This could be due to a malfunctioning transfer case control module, a faulty switch, or an issue with the system's sensors. It's advisable to check for error codes using an OBD-II scanner and to inspect the wiring and connections for any faults. If the problem persists, consulting a professional mechanic may be necessary for a thorough diagnosis.