Question about 1992 Ford Ranger
Either the vacuum supply to the DPFE (Delta Pressure Feedback EGR) sensor has been compromised due to a disconnected or broken vacuum line, the electrical connection to the DPFE sensor has come off, or the DPFE sensor itself has gone bad. The sensors are such a high fail item that they are now available at aftermarket venues like NAPA and Auto-Zone.
Check your connection, if it's tight, check the vacuum hoses. There will be two or three depending on the style of your sensor. Regardless of the count, there will only be about a foot of hose to check. If the hose is bad, it will obviously need to be replaced, but it can't be standard vacuum/washer solvent hose due to the application. Your friendly Ford dealer has the hose in bulk. It a silicone compound type hose to better resist the heat. I
f the hose is OK, then the DPFE needs to be replaced. Prepare to shell out around $80 to $100 depending on your particular application. If the new one looks different than the old one, it's OK as long as it has the same number of vacuum ports and the electrical connector is the same.
Posted on Feb 26, 2009
HI.. On your Contour.
The code P0401 is refer to a Insufficient EGR flow Detected.
Or EGR system performance.
The most possible solution for this code is The replacement
Of the : EGRVR. Selenoid.
But go to the DEALER to buy them.
Because the aftermarket is like UNIVERSAL.., and you gonna have the same problem.
OK... I hope this help on your question.
Thank you for use fixya..
Posted on Aug 06, 2008
I would check the front o2 sensors because usually the EGR flow is detected by:
The detect operation of the system, the solenoid is disabled and the o2 compensation control is monitored. If the EGR system is operating properly, turning it off shifts the air/fuel ratio in the lean direction. o2 sensor data should indicate an increase in oxygen in the exhaust gases and cause the short term control to shift rich. The amount of the shift indirectly monitors the operation of the system.
Posted on Oct 13, 2008
Based on what the tech manuals say I would change the DPFE sensor for the EGR Valve, careful not to tear the special silicone rubber hoses that go to it from the exhaust, as a Ford dealer tech I saw these codes allot, and the DPFE sensor was almost always the issue or the hoses going to it.
Posted on Oct 16, 2008
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