2001 Explorer 6cyl, 4.O L trouble codes
 

Hi all,I have a 2001 Explorer Sport with a 6cyl/4.0L engine in it, i have been told it is what is called 2nd generation engine, because it replaced the original engine that was in these models. Anyways, my check engine light came on and i have recieved these codes, P0401, P0171, P0174. Any ideas on where and what i should be looking at to help solve them. Any and all help is greatly appreciated. Thank you in advance.

RE: 2001 Explorer 6cyl, 4.O L trouble codes
 

I'd start by replacing the DPFE. This is a common code generator for these codes.





P0401
Exhaust Gas Recirculation Flow Insufficient Detected

P0171
System tooLean (Bank 1)

P0174
System too Lean (Bank 2)

RE: 2001 Explorer 6cyl, 4.O L trouble codes
 

Ive been looking around online at the dpfe thingy, what is the difference between the one for $26.00 form autozone, and the one for about $72.00 from O'reilly's? That seems like a wide range in price for that thing. Is it worth it to spend the extra money on that part. Any ideas and help is appreciated. Thank you

RE: 2001 Explorer 6cyl, 4.O L trouble codes
 

Should be no difference except for the MFG of the unit and how much they want to charge you for it. I show Autozone listing the one for your vehicle for $48. You could cruise EBAY and pick one up for about $20-25. I just got one for my 2000 Taurus for $25 including shipping.

RE: 2001 Explorer 6cyl, 4.O L trouble codes
 

Well i replaced the dpfe sensor, and erased the codes out of the system, i went driving for a while. The CEL light came back on, but this time it was just for 0171 and 0174. The 0401 was gone. Any ideas of what to look at?!

RE: 2001 Explorer 6cyl, 4.O L trouble codes
 

Look for a vacuum leak somewhere

RE: 2001 Explorer 6cyl, 4.O L trouble codes
 

Yea, i found some older posts and some other sites that said for the 2 codes i have now to do 1 of several things. Look at the MAF sensor and possibly clean it if need be. Check the O2 sensor, one of those may be bad, and the vacuum leak. So i guess i will hunt around for those problems the next few days.

RE: 2001 Explorer 6cyl, 4.O L trouble codes
 

are there any particular areas to look at for the vacuum leak?!?!

RE: 2001 Explorer 6cyl, 4.O L trouble codes
 

I am getting the same codes (Lean) I was told to change the lower intake manifold gaskets. Have you found your problem?