A few weeks ago I got a CEL caused by a P0405 (Low EGR voltage) code on my 2006 F-250 6.0. I noticed no other symptoms. Internet searches indicated the solution was to replace the EGR valve. As I was leaving the parts store the CEL went off, but I replaced the valve which was quite dirty. It did seem to "smooth" out the engine a bit. This morning the CEL came on again and it was the same code. Again, no symptoms. This afternoon I reset the code and the CEL didn't come back on during my 10 minute drive. Any ideas on what is causing this?
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Phantom EGR code
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