HELP P0401 3.0 EGR checks ok
#1
HELP P0401 3.0 EGR checks ok
When I pull vacuum on new EGR engine stutters therefore it seems good. I have 12v at solenoid and 45 ohms across pins which I read is good, any suggestions on next thing to ck? Thanks
#2
According to: OBD-II Trouble Code: P0401 Insufficient EGR Flow
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Causes:
A code P0401 most likely means one or more of the following has happened: The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced, There is a blockage in the EGR (tube), most likely carbon buildup,
The EGR valve is faulty The EGR valve may not be opening due to a lack of vaccuum
Possible Solutions
In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit. Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
Clean out the EGR valve and/or tubing to remove deposits Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
Replace the DPFE sensor (with a good quality / OEM one)
Replace the EGR valve
I can't help you with specific values!
Copyright © OBD-Codes.com
Causes:
A code P0401 most likely means one or more of the following has happened: The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced, There is a blockage in the EGR (tube), most likely carbon buildup,
The EGR valve is faulty The EGR valve may not be opening due to a lack of vaccuum
Possible Solutions
In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit. Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
Clean out the EGR valve and/or tubing to remove deposits Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
Replace the DPFE sensor (with a good quality / OEM one)
Replace the EGR valve
I can't help you with specific values!
#5
Mazda never does!
Make sure you line up tabs!
It turns in, not push in.
I just ordered a new one for my car, last changed in 2011! and I have low mileage! Ever clean your throttle body or MAF! Try it it might like it!
Last edited by UseYourNoggin; 08-01-2014 at 08:02 PM. Reason: PCV ordered, throttle body
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mazdagirl8
Mazda Protege
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09-22-2011 01:30 PM