New to me ranger - chasing down code p0400


Romac

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Friday I picked up a Ranger to daily drive this winter from a local dealer so I could put my ST up in the garage. Truck looked decent, not beat to death, no rust issues other than one wheel arch, ran strong 2.3 Duratec with a manual. I made them a cash offer and they accepted. It needed tires about two years ago, so Saturday I went and had new tires put on it. Other than that it’s been absolutely great, runs good, over the past few days I’ve had it, it seems to be getting excellent gas mileage.

Today leaving work the check engine light came on, truck didn’t appear or feel to me like it was running any differently so I made it through the nightmare of traffic, stopped a couple errands for my wife, CEL still on, but truck still behaving as it had the past few days I’ve owned it. Hooked up my scanner when I got home and it’s throwing p0400, which after googling is EGR malfunction. Now that being said, I know absolutely nothing about these trucks, I’ve been googling for the past hour and found that the EGR valve is apparently a nightmare to get to. Some other posts randomly mentioning that it’s likely DPFE sensors, and yet more posts saying that the 2.3 do not have DPFE sensors. So I’m basically lost at this point on what to do? What exactly should I be looking for and looking to change to get this taken care of? How concerned should I be about this? It’s not my primary vehicle so if it needs to go down for a bit that doesn’t really effect me, but it’s also stressful to have problems so soon, especially with what appeared to be a strong candidate compared to my options at the time.
 


Rock Auto 5% Discount Code: 248EE46702D889 Expires: October 1, 2019

adsm08

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RockAuto lists a DPFE for that truck, so it should have one.
 

Romac

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RockAuto lists a DPFE for that truck, so it should have one.
Interesting any idea where it is location wise on the truck?

Also I cleared the code with my scanner, drove about another 60 miles so far, completely and totally fine and light hasn’t crept back on yet. This ones a head scratcher
 

fizzicks

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I had the same issue showing up with a lean code too, I cleared it 110 miles ago and it hasn't come back.
 

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I would imagine it is close to the valve, which is in a bugger spot on the rear of the head, but I don't know for sure.
 

Dirtman

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So friggin big!
My credo
Give me money.
The 2.3 d-tech has an electronic egr valve and they are pretty damn durable from what Ive seen. P0400 is the computer equivalent of saying "I have no idea what happened". There are codes for insufficient flow, excess flow, circuit faults etc on the egr system but 0400 is just a generic fault. Personally I would just wait and see if the code re-apears. If your scanner has live data scroll down to the EGR and watch to see if its showing it open and closing at the correct times.
If it is, and no code comes back... Ignore it.
 


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