Re: The Dreaded P0401 Code
Oh dear....the p0401....
I had the same engine on the original battle wagon, a 98 sable. Same thing happened repeatedly. I don't know what you are referring to as the egr pipe, but there is a tiny little passage cast into the air intake manifold that allows air to move. Through from the e.g.r. to the t.b. (or maybe it was the other way around?) Whatever. It's a fishhook shaped passage, and tiny. You need to remove both the t.b. and the. E.g.r. and push through it with a piece of wire and then clean it out with a pipe cleaner and some TB cleaner. Im sorry I don't have pics or a sable to go out and look@ it to give you better instructions. But it is there, and it was the cause of my issue. In fact, after I found it and cleaned it I realized I should not have bought the new e.g.r valve after all, and it had been the problem the whole time. The d.p.f.e. sensor, though, jammed up every year until I found it, thank god for lifetime replacements....
if your dpfe continues to blow regardless of clean and operational valve, solenoid, TB etc, then this is most likely your problem. just look for all of the ports going in and out of the intake manifold around the TB and EGR, and you should see it.
i just found my old post about it, the port, apparently, is half-moon or c-shaped. I can almost picture it in my head. It's there, trust me. look for all the gunk you can find, and start cleaning it out. It should stop the dpfe issue.