Help with 401 code
Thread Starter
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New User
Joined: Jan 2007
Posts: 10
Likes: 0
From: Illinois
Help with 401 code
My truck is throwing a 401 code. It's a 97 F150 4.6 108,000 miles. I cleaned the egr ports, checked vacuum lines, polished my headlight lenses (needed a change of pace), checked DPFE. Still throwing the code. I have a buddy who works at the NAPA store and he sold me a DPFE that I could bring back if that wasn't it. Tried the new one, same problem. Have seen posts saying that aftermarket DPFE sensors don't last, but right out of the box? I checked the reference voltage at the harness and it's 3.4. That's with the harness unplugged, does this matter? Ok guys and gals that's my info, don't let me down. Point me in the right direction. I need your help.
Laughing Gas
Joined: Oct 2003
Posts: 967
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From: DC
Sounds to me like you've done all the right things. Maybe this post will help. https://www.ford-trucks.com/forums/1...f150-4-6l.html
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
Did you clear the code, run two drive cycles to see if it comes back?
You don't just replace the unit and the light goes out.
It might go out after some drive cycles but don't count on it.
There are hoses, the stand tubes, the EGR tube and it's calibrated internal restriction, The EVR and it's hoses.
The flow is measured by the sensor looking at the difference in pressure between each side of the restriction (the two stand tubes) when the EVR is comanned to open the EGR a calibrated amount.
It's not a simple operation. There are to many places things can go wrong.
You don't just replace the unit and the light goes out.
It might go out after some drive cycles but don't count on it.
There are hoses, the stand tubes, the EGR tube and it's calibrated internal restriction, The EVR and it's hoses.
The flow is measured by the sensor looking at the difference in pressure between each side of the restriction (the two stand tubes) when the EVR is comanned to open the EGR a calibrated amount.
It's not a simple operation. There are to many places things can go wrong.
Thread Starter
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New User
Joined: Jan 2007
Posts: 10
Likes: 0
From: Illinois
Problem solved... took it to autozone (a 20 mile roundtrip) and found out that it was now throwing a PO113 code. I forgot to reconnect the intake air temp connector. I just bought an OBD scanner off ebay. I'm not going through this again. Thanks guys.
