EGR=Exhaust Gas Recirculation
DPFE=Differential Pressure Feedback of EGR
THE DPFE sensor has two ports on it. One is the REF (reference) and the other is the HI (high pressure) port. They meter the pressure on either side of a venturi in the EGR pipe. (The area where the EGR pipe is reduced in diameter.) If there is a problem with the EGR system, there is no pressure drop across the venturi. You then get a lovely CEL (Check Engine Light).
All which the PCM (Powertrain Control Module) controls and monitors.
Fun stuff, huh?
BP
