97 4.6 code P0401
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Freshman User
Joined: Mar 2005
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97 4.6 code P0401
My 1997 4.6 check engine light came on 2 months ago. I checked the code and it was a P0401. I replaced the EGR valve and cleared the code. This week the engine light came on again and I pulled the same P0401 code. I replaced the DPFE sensor. One day later the check engine light is back on. Any ideas what I can try next?
Tim
Tim
Senior User
Joined: Nov 2003
Posts: 263
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From: Royal Palm Beach, Fl
P0401
There are several reasons this code can appear. I just fixed my 98 F150 4.6 L 112,000 Miles with the same code. It turned out to be the EGR Ports were clogged with carbon. Disconnect the vacuum hose from the ERG Valve and cap it. Then apply vacuum (outside source) to the ERG while the engine is idling. If it continues to run smoothly the ports are blocked. The engine should stumble or stall if the ports are clear. To clean them you will have to remove the throat from the manifold. The EGR Valve or the PDFE Switch could also be the problem.
