EGR question
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Junior Member
Joined: Jan 2005
Posts: 1
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From: St. Louis, MO
EGR question
I've got a 02 4.6 Ltr that the service engine light came on went to Autozone and had them check it and the code reader said I had a bad EGR valve, put a new one on and the check engine light came on again this time it said "low output on EGR Sensor" is this an easy fix or does anyone know what my problem might be other than this, don't want to keep chasing things down if I'm going the wrong way. Thanks
Chris.
Chris.
Senior Member
Joined: Jul 2004
Posts: 6,200
Likes: 39
From: Easton, Pa.
You run into a problem with this kind of diagnostics.
The code discription doesnot always tell you what part is faulty because there are often more parts in the 'system' at fault.
What code/s are you getting first then we can tell you more about it.
Again, looking at a code list is not all there is to it and sells parts you may not need..
The code discription doesnot always tell you what part is faulty because there are often more parts in the 'system' at fault.
What code/s are you getting first then we can tell you more about it.
Again, looking at a code list is not all there is to it and sells parts you may not need..
Senior Member
Joined: Sep 2003
Posts: 1,104
Likes: 0
From: WY
You're probably pulling code P0401, Low EGR Flow. It's pretty easy to fix.
The EGR valve seldom, if ever goes bad. It's not expensive, and for piece of mind, don't worry about having changed it. At least you're now familiar with this part of the engine and getting the valve off again to fix the real problem should now be a snap.
Normally, all you have to do is clean out the ports going from the EGR valve into the air intake. On my '97 4.6L, the EGR valve is attached to an air intake elbo. All you have to do is remove the elbo and clean out the two ports. I just used a screw driver to break up all of the carbon in the ports. Not a big job, takes about 1 hour.
The DPFE sensor tends to go bad at the same time the ports get clogged. Not a bad idea to change it out while you're working on it. When reinstalling the DPFE sensor, ensure you put the large inside diameter hose and small inside diameter hose on the correct connectors (one big/one small). The connectors on the new sensor may not be in the same position as your original sensor. If you install the hoses backwards, you will still get code P0401.
The EGR valve seldom, if ever goes bad. It's not expensive, and for piece of mind, don't worry about having changed it. At least you're now familiar with this part of the engine and getting the valve off again to fix the real problem should now be a snap.
Normally, all you have to do is clean out the ports going from the EGR valve into the air intake. On my '97 4.6L, the EGR valve is attached to an air intake elbo. All you have to do is remove the elbo and clean out the two ports. I just used a screw driver to break up all of the carbon in the ports. Not a big job, takes about 1 hour.
The DPFE sensor tends to go bad at the same time the ports get clogged. Not a bad idea to change it out while you're working on it. When reinstalling the DPFE sensor, ensure you put the large inside diameter hose and small inside diameter hose on the correct connectors (one big/one small). The connectors on the new sensor may not be in the same position as your original sensor. If you install the hoses backwards, you will still get code P0401.