Question about Ford F-150
off, EGR valves seldom fail. Yours probably had nothing wrong with it in the
DPFE sensors, OTOH, have been a problem for Ford for years. Best results have been obtained with the upgraded Ford replacement.
Make certain the hoses to the DPFE sensor did not get reversed and are not clogged if you have the non-plug-on version. If the upstream hose is getting blown off or is over-pressurized, clogged cats could be the issue.
Check the Vacuum line at the EGR valve for vacuum at idle and while reving the throttle. It should not have and vacuum while the vehicle is not in motion.
It should not have any vacuum while the vehicle is not in motion.
If it does, you'll have EGR flow at the wrong time which usually causes idle problems and low speed stumbling/misfires. EVR solenoid is either dirty or sticking open. Try popping the cap off and cleaning the filter element and the top of the valve with compressed air.
It takes a minimum of two drive cycles in which OBDII runs the EGR test for it to turn on the MIL if there are failures.
When the code is cleared typically you have to run through a specific cycle. With Ford a normal driving can take a couple of days to a week or more. There is page that lists the cycle and you can run through it about 45 minutes
Click on the link directly:--
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Posted on Aug 28, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
The fault code P1405 in most case is a bad DPFE (Differential EGR Pressure Feed Back) sensor, or, a plugged or cracked hose to it.
Locate the DPFE sensor on the driver side of the intake manifold, and has 2 hoses and a 3-wire electrical connector on it (if the sensor has been replaced, it may be black plastic instead of aluminum).
Inspect the 2 hoses that run from the DPFE sensor to the EGR supply pipe for leaks or blockage. Make sure the hoses are connected securely at both ends.
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