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2001 ford ranger exhaust problem

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  #1  
Old 08-12-2006
paw
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2001 ford ranger exhaust problem

Hi, my son has a code p0402 on his ford ranger. I am trying to find out what to look for in fixing this problem. the code is an Exhaust gas Recirculation Flow Excessive detected. hope someone can enlighten us as to the problem and how to fix it. thanks (sorry i am a brand new member so please bear with me) thanks again cp
 
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Old 08-13-2006
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i feel bad that nobody's replied. i have no idea how to fix it though sorry =(

maybe this bump will get someone's attention.
 
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Old 08-13-2006
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P0402 is for excessive EGR flow detected.

It could be a few different things but the odds are 99% that it is a bad Differential Pressure Feedback EGR sensor, the sensor that measures the EGR flow rate. The DPFE sensors were very unreliable around 2000~2001 and most end up getting replaced. Approximate price for the part is $40~$60 and it is not difficult to change.

The background in this picture is not a Ranger but the Ranger DPFE sensor looks the same.



 
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Old 05-25-2007
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so just pop the old DPFE off and replace with a new one?
 
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Old 05-25-2007
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yeah....
 
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Old 05-25-2007
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alrite, i replaced the sensor, but my check engine lights still on, do i need to have it cleared or is something else wrong???
 
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Old 05-25-2007
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You can take it to autozone and they will read and clear the code, or if you disconnect your battery for a little while, it will reset itself as well. I think 30 minutes is the time frame needed...
 
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Old 05-25-2007
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Originally Posted by greygooseranger
You can take it to autozone and they will read and clear the code, or if you disconnect your battery for a little while, it will reset itself as well. I think 30 minutes is the time frame needed...
autozone can and will read /clear it
as far as the battery, you really only need disconect for a few minutes
 
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Old 05-25-2007
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To clear your computer very quickly after you unplug it from the battery, just tap your brakes. The rear lights willl try to light up draining it. edit: draining any excess energy in the system, not the battery.
 
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Old 05-29-2007
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I just got the same code today. Apparently Ford's DPFE sensors have a reputation of going bad regularly. Ford has even told techs not to bother even diagnosing if a P0401, P0402, P1401, or P1402 is stored, and to just replace the DPFE sensor. But the problem could also be that the EGR valve is sticking. The valve itself looks like this:

It's located at the right rear corner of the intake manifold, near the firewall, next to the DPFE sensor.
 
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Old 05-29-2007
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Originally Posted by 04 EDGE
oh and Bob have you bought a DPFE sensor from ford latley?
03 Ranger 4.0's don't have EGR. Fortunately, I've never had to replace a DPFE on any of my own vehicles.
 
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