The infamous P0401 !!
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New User
Joined: Aug 2006
Posts: 5
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The infamous P0401 !!
Late last year I had an issue with "lean banks" as well as the P0401 (EGR low flow) on '02 4.0L Sport Trac. I found the P0173 and P0174 vacuum leaks. But the EGR P0401 came back on after initially clearing all the codes.
I replaced the EGR valve, cleared the code (using a code reader) and within a day it was back on. I was going to go after DPFE sensor next, but I thought if were that, I would have gotten the DPFE Sensor voltage code?
Help !!
I replaced the EGR valve, cleared the code (using a code reader) and within a day it was back on. I was going to go after DPFE sensor next, but I thought if were that, I would have gotten the DPFE Sensor voltage code?
Help !!
Cargo Master
Joined: Aug 2003
Posts: 3,263
Likes: 92
From: BC Canada
The DPFE Sensor is what usually fails and/or the silicone hoses that connect to the exhaust manifold.
I have drilled the rivets and cleaned the sensor screen with good results, (wife says it is my scott/jew background that makes me do such things, LOL)
I have drilled the rivets and cleaned the sensor screen with good results, (wife says it is my scott/jew background that makes me do such things, LOL)
