Codes 401 &171
Posting Guru
Joined: Dec 2002
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From: peoria, az
Vee, if you could see the connector, you would probably notice that it is held in place on one end. You should be able to pull it apart with one hand. ( the place where it is held will act as a second hand) You have to be kind of limber but, it can be done.
Posting Guru
Joined: Dec 2002
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From: peoria, az
Sloop....I just caught up with this thread, did you figure out the 171 code or was that something caused by the 401? Don't mean to sound dumb but, I don't get much training at work so I come here to learn.
Cross-Country
Joined: Aug 2003
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I didn't have a 171(edit)>(or did I? I have forgotten),just a 401. I induced a 402 (excessive flow,EGR) mith my new mighty vac. then it code reverted to 401,so I replaced the exhaust flow sensor(what IS that thing called again?)and blew out the exhaust tube feeding it and all has been well with it since. Alas,not so with my ongoing "slow response" codes! 
A 171 most likely is either a intake leak,or a non-firing injector, odds being a intake leak.Along with a mulitude of other causes. If you have a 171,I'll list 'em,otherwise nevermind. Wah!
I have been on a crash course to learn all about OBDll trouble codes and their most likely cause for the last 6 months or so. All on my own,NO help from my shop either! The non-supportive(insert obscenity here) that they are!
A 171 most likely is either a intake leak,or a non-firing injector, odds being a intake leak.Along with a mulitude of other causes. If you have a 171,I'll list 'em,otherwise nevermind. Wah!I have been on a crash course to learn all about OBDll trouble codes and their most likely cause for the last 6 months or so. All on my own,NO help from my shop either! The non-supportive(insert obscenity here) that they are!
Last edited by slooptom; Dec 28, 2003 at 09:45 PM.
Cross-Country
Joined: Aug 2003
Posts: 60
Likes: 1
Ah,the DEF. That checks the differance in pressure in the EGR plumbing and decides if the flow is suffient. On the left side of the intake(on a 4.0,anyway),black or natural aluminum finish, two rubber hoses to it.two screws holding it on. The aluminum one is prone to corrosion failure. $50.00 or so. Easy to change.
(edit)>
Let me add this to that!
"Ford uses a Differential Pressure Feedback EGR (DPFE) sensor on these vehicles to measure EGR flow. Ford tests to see if the EGR valve is stuck open by checking the DPFE sensor at idle. The DPFE sensor tests for a differential in pressure across a restriction. As flow increases, DPFE voltage rises. Typical DPFE readings at idle are around 0.6 volts DC."
(edit)>
Let me add this to that!
"Ford uses a Differential Pressure Feedback EGR (DPFE) sensor on these vehicles to measure EGR flow. Ford tests to see if the EGR valve is stuck open by checking the DPFE sensor at idle. The DPFE sensor tests for a differential in pressure across a restriction. As flow increases, DPFE voltage rises. Typical DPFE readings at idle are around 0.6 volts DC."
Last edited by slooptom; Dec 29, 2003 at 06:40 PM.
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