Question about 2000 Mercury Cougar
My 2000 Mercury Cougar has been showing the CEL for a while now. The guys at Autozone said the code was P0401 - Insufficient EGR circulation. I took the car in for an estimate and the mechanic told me the DPFE/EGR pressure sensor was faulty and needed to be replaced. Since I wanted to learn more about fixing my car myself, I looked the DIY for DPFE replacement online. I switched my DPFE sensor (part# F7ue-9j460-AA) with BWD EGR155 from Advance auto parts. However, 10 miles after resetting the codes (by disconnecting battery), the CEL was on again. What could be the problem? Should I replace the EGR valve or solenoid? What diagnosis can I do to figure out whats faulty? The only other symptom is slightly lower gas mileage, but since I drive in Boston traffic I cant say for sure if the EGR is causing that.
I would really appreciate your help.
Yes it will. Clean out all the ports for the EGR valve check PCV valve if equipped. Vacuum lines can cause this problem also
Posted on Jul 22, 2009
Posted on Jul 20, 2009
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Posted on Jan 02, 2017
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Insufficient EGR Flow
What does that mean?EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.
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