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International Automotive Technicians Network
Re: ECM (/PCM) Output Types
Posted to Technical Discussion Forum on 8/22/2004

Late model fords also use an O2 sensor called a "FLO" (Fast Light Off). The heater circuit is apx half the resistance of previous O2 so current flow is apx double - hence the name "Fast Light Off".

They are not interchangeable!

The PCM controls the ground ... Login to read more.