97' F150 4.6L 4X4 Error Code P0401
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97' F150 4.6L 4X4 Error Code P0401
I've sprayed B12 and try to clean out the EGR valve and the solenoid (not sure what it's called) above the EGR. The diaphragm works. Did I not clean them enough?
Doug
Doug
Last edited by Torque1st; Feb 20, 2006 at 11:32 PM.
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Joined: Jan 2004
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From: St Louis
P0401 troubleshooting
Originally Posted by doug1003
I've sprayed B12 and try to clean out the EGR valve and the solenoid (not sure what it's called) above the EGR. The diaphragm works. Did I not clean them enough?
Doug
Doug
It's usually either a faulty DPFE sensor or the EGR ports behind the throttle body are clogged that causes the P0401.
Apply a vacuum to the EGR valve while idling.
If the engine stumbles and stalls, the ports are clear and the EGR valve is operating. Go after the DPFE (98% liklihood).
If no change, either the ports are clogged (98% again) or the EGR valve has failed.
Steve
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From: Maple Grove, PA
DPFE is located on drivers side against the firewall.....see couple tubes comming into the top of it.....it's like 3 inches tall by 1 inch square or somethign close to that.....mine went bad....try like project sho89 said about the egr first to see if thats working though for sure.....i got my DPFE sensor from a friend thats a mechanic for 15 bucks......thats your cheapest bet for the part if you have the hook-up
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