Running issue and code.. please help
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Running issue and code.. please help
Hey, i have a 96 f150 4.9. Trucks showing a p0420 code and sometimes runs rough at idle. I have read that a lot of times this means the cats bad. I replaced the whole exhaust and put a new cat on since i was replacing everything. Still have the code showing. My next things are the 02 sensors. Ive also heard that the tps can cause something like this where the truck runs rough and can cause a code. Anybody have experience with this problem. Thanks a lot.
-Jesse
-Jesse
Fleet Owner
Joined: Oct 2005
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From: Kentucky
OBD-II Trouble Code: P0402 Exhaust Gas Recirculation (EGR) Flow Excessive Detected
Causes
A code P0402 most likely means one or more of the following has happened:
* The DPFE (differential pressure) sensor is faulty and needs to be replaced
* There is a blockage in the EGR (most likely carbon buildup)
* The EGR valve is faulty
* The EGR valve may not be opening due to a lack of vacuum
Causes
A code P0402 most likely means one or more of the following has happened:
* The DPFE (differential pressure) sensor is faulty and needs to be replaced
* There is a blockage in the EGR (most likely carbon buildup)
* The EGR valve is faulty
* The EGR valve may not be opening due to a lack of vacuum
Thread Starter
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Senior User
Joined: Dec 2010
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From: Southern California
Fleet Owner
Joined: Oct 2005
Posts: 20,783
Likes: 1,751
From: Kentucky
I am not sure where the DPFE is located on a 4.9L engine. I did find this handy test procedure for the DPFE Sensor: Ford DPFE Sensor Test
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