How to Replace the DPFE Sensor on a Ford Escape – A DPFE (delta pressure EGR feedback) of a vehicle exhaust sensor is designed to detect the amount of EGR (exhaust gas re-circulation exhaust) flow. EGR is used to introduce burnt exhaust gases back into the engine through the intake manifold at cruising speeds only. This introduction of the exhaust gas helps to prevent pre-ignition by the cooling of the combustion temperature, and helps to reduce emissions. A bad sensor will cause a stumble or a rough engine at half throttle around 40 mph. And when the sensor starts to fail, the “check engine” lights and displays a code “P0401″, which means that the EGR flow is insufficient.
Things You’ll Need
Set of ¼-inch sockets
¼ inch ratchet
- Remove the rubber tubing from the bottom of the DPFE sensor. The sensor is located in the security server in the rear of the EGR valve. It is a square black box with an electrical connector plugged into the front. When the tubes are removed, inspected to contamination. Often, the larger hose is filled with a white powder in appearance caused by moisture. Use a small screwdriver or pick and let loose and shake the dust out. If hoses are heavily contaminated, remove and clean out.
- Remove the electrical connector from sensor. Remove the two screws holding the sensor on the firewall.
- Sensor bolt back into the firewall. Install rubber hoses in the bottom of the sensor, and plug in the electrical connector.
- Clear the codes to reset the “Check Engine” light. Plug the code scanner to the OBD connector, located under the dash on the driver. Turn the ignition switch to the on position without starting the engine — just make sure that the instrument panel lights are on. The code scanner has a “Delete” button. Press this button and the scanner will display “Wait”. When the scanner displays “Codes clarified,” the check engine light should go on the instrument panel. If the light does not turn off, turn the ignition key off for a few seconds and start the car. The light should be off at this time.