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I don’t even know where to begin with this nightmare that I’ve been facing over the last couple weeks. I bought the truck back in March, it had right around 173k (It’s at 177k now) miles on it (if that matters), and it had the fabled P0420 code. Well I wanted to fix it and I wanted to fix it right, but I drove on the code until recently, where I replaced the Cat Converter with a Bosal unit, and new o2 sensors. Well the P0420 is gone so far, but it has been replaced by another stick in my butt known as the P1401. Now I did my research, its an EGR Pressure Feedback high circuit blah blah blah. It was making me think electrical problem, and it was! The sensor and connector had found themselves laying against something hot, and promptly melted together. That seems enough to throw a voltage issue. So I bought a new Motorcraft EGR Pressure Feedback sensor, 2 new hoses for it, I went to a junkyard and found a connector for the sensor since mine was absolutely destroyed. I spliced the new connector in (I had both connectors facing the same way when I was doing this and only did one wire at a time), hooked the sensor up, plugged it in, and there it is. Still looking at me with it’s ugly face. I honestly don’t know what to do now. I am just at a total loss. I just want my truck to run well and have no check engine light. Is that so hard?
Also I think I read somewhere that this particular monster also blocks other codes and readings such as from the oxygen sensors but I don’t know. If it is, then there is a possibility that even if I fix this, that p0420 might still be around the corner, and all of this time, money, and effort was for not. I don’t even know what I would do if that was the case. I don’t want to drive on the truck right now as I don’t want to mess up the brand new cat, am I right for thinking that? I know that the EGR keeps combustion temps cooler, and I would really appreciate not melting this cat.
Any help, advice, tips, tricks, experiences, etc., will all be greatly appreciated.
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See if this helps. You could have a problem where the wires melted affecting signal voltage.
http://www.justanswer.com/ford/40xmd-causs-p1401-ford-ranger.html
The wires didn’t melt, only the actual connector did, where it plugs into the sensor. I have replaced the DPFE twice now, both still return the P1401. However, it does not return the code on the first start after clearing the code. If I crank it, let it run, turn it off, and crank it again, the code reappears after about 10 seconds of it running.
I really need help with this, this truck has been down for 3 weeks now and I need to to be working right. It drinks gas and I know that isn’t good for the catalytic converter that I just freaking put on there. This is insane how much trouble this has caused.
EDIT: I’m really concerned with the wires that are running to it. The original wires going to the connector were RED BLUE and BLACK, but everywhere I read, they refer to the wires as wires with stripes on them, instead mine are solid. I really hope that it didn’t get crossed up somewhere, because if it did, then I’m trying to chase down someone else’s screw up. I noticed there is a plug on top of the intake that had also been spliced in at some point (how can I tell a factory splice?), and it is a VERY similar plug, the only difference is a little fin on the back is on the wrong side.
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