P0174:dpfe Sensor???

knightof206 · February 14th, 2009, 01:05 AM

Recently i had 2 codes pop up and i have 3 total, one is cuz i have no cats, another is my coil was bad, i replaced the bad coil and replaced all spark plugs.
but code P0174 is sticking around, i cleaned my MAF with electronics cleaner and it didnt fix it, i can notice that something is wrong to cuz there a smell that is awlays around since it happend and it puts a horrible taste in my mouth and my idle jumps around a lot. what should i replace next?

Mach Boy · February 14th, 2009, 10:14 AM

It's because you're running lean. You might have a leak somewhere.

wraitherx · February 14th, 2009, 02:03 PM

^that be it, do you have MIL eliminators on since you dont have cats? also take your DPFE sensor off and make sure that there is no water in it. there have been instances that ive read where there was water in their DPFE and causing codes to throw, also check your hoses. the DPFE, BTW, is on the bolted onto the back of the intake manifold and there are 2 hoses and 1 plug running into it.

knightof206 · February 14th, 2009, 07:20 PM

also i set my tuner to show me my fuel trim in and bank 1 was always around 1.00 but bank too was always 1.20 or higher if that means anything

Mach Boy · February 14th, 2009, 08:13 PM

Check for an air leak on the left side near the midpipe/header connection.

knightof206 · February 14th, 2009, 11:10 PM

i do have partially welded in straight pipes for Cats and i recently broken off my muffler connection from going over a hill to fast and landing. should i have my O2 connected or not?

Trick Tuners · February 16th, 2009, 07:32 PM

Originally Posted by knightof206

also i set my tuner to show me my fuel trim in and bank 1 was always around 1.00 but bank too was always 1.20 or higher if that means anything

If the fuel trim ever stays right at 1.0 then the tune is way out of calibration and its switched over to open loop because it thinks the sensor is bad. Considering that the other bank is high too i would assume that this is the case. Its possible that bank 2 has a header leak, or bad o2 sensor. I would contact your tuner and have them dial the tune in better.

knightof206 · February 17th, 2009, 01:07 PM

also on my tuner it shows my MAF voltage as n/a, does that mean my MAF is out or can the tuner just not detect that?

Trick Tuners · February 17th, 2009, 02:00 PM

try using maf counts instead of voltage.

knightof206 · February 18th, 2009, 02:44 PM

i fixed it i replaced the O2's and cleaned the MAF better, it was on a open-loop config cuz after i fixed it my cars fuel trim goes from .8 to 1.2, but i cant find any information on what MAF counts are for cuz mine go from 300 to 500.

Trick Tuners · February 18th, 2009, 03:42 PM

Originally Posted by knightof206

i fixed it i replaced the O2's and cleaned the MAF better, it was on a open-loop config cuz after i fixed it my cars fuel trim goes from .8 to 1.2, but i cant find any information on what MAF counts are for cuz mine go from 300 to 500.

It sounds like a bad maf. Hopefully you didn't touch the sensor. on the stock maf 300 counts should be about 4000rpms in neutral, and 500 is about 3500 rpms at WOT.

~C~ · February 19th, 2009, 08:31 AM

After you figure out everything, I have the stock MAF if you need one. Let me know.

knightof206 · February 19th, 2009, 05:26 PM

WTF i cleaned the MAF and replaced the 02 and today it came back with p0174, it seems that my MAF is bad. ill pm about buying yours.

Trick Tuners · February 20th, 2009, 11:59 AM

Post up a datalog before you go spending money on a maf. It could easily be the tune.

knightof206 · February 20th, 2009, 02:59 PM

my car is acting really wierd now, it shut its self down when i was coasting down hill then when i started it it up it started revving out of nowhere and when i hit the gas it would studder really bad before it took off so i returned my car to the stock tune and it seems to work fine and my check engine light was gone but on the way home it came back i checked the codes and it had p0331,p1501,p1000,p1501,p0325,p700,p0174, WTF. and the codes that is awalys there isnt theres which is the one for not having cats but my car is finally running normally but a ton of codes poped up

wraitherx · February 20th, 2009, 03:08 PM

p0331-Knock sensor 2 cirucuit range (bank 2)
p0325- Knock sensor 1 malfunction (bank 1)
p0174- System too lean (bank 2)
p1501- Vehicle speed sensor out of self test range
p1000- monitor testing not complete

sounds like something with your tune, I would get it checked out ASAP. datalog it and send it towards JOE

February 14th, 2009, 01:05 AM	#1
knightof206 Newbie 1999 mustang Cobra Join Date: Jan 2007 Location: marthasville,mo Posts: 38 iTrader: 0 reviews	P0174:dpfe Sensor??? Recently i had 2 codes pop up and i have 3 total, one is cuz i have no cats, another is my coil was bad, i replaced the bad coil and replaced all spark plugs. but code P0174 is sticking around, i cleaned my MAF with electronics cleaner and it didnt fix it, i can notice that something is wrong to cuz there a smell that is awlays around since it happend and it puts a horrible taste in my mouth and my idle jumps around a lot. what should i replace next? __________________ Lowered, Magnaflow o/r X pipe, Magnaflow MagnaPack Catback, JLT CAI, Livewire Tuner

February 14th, 2009, 10:14 AM	#2
Mach Boy MM's Orangest 2004 Mach 1 Mustang Join Date: Sep 2007 Location: Indy Posts: 2,846 Blog Entries: 1 iTrader: 1 reviews	It's because you're running lean. You might have a leak somewhere. __________________ Looking for 03/04 4V ABS Wiring Harness Connector/Incomplete Wiring Harness (with ABS connector)

February 14th, 2009, 02:03 PM	#3
wraitherx Moderator '99 SVT Cobra Join Date: Nov 2006 Location: Virginia Beach, VA Posts: 9,568 iTrader: 11 reviews	^that be it, do you have MIL eliminators on since you dont have cats? also take your DPFE sensor off and make sure that there is no water in it. there have been instances that ive read where there was water in their DPFE and causing codes to throw, also check your hoses. the DPFE, BTW, is on the bolted onto the back of the intake manifold and there are 2 hoses and 1 plug running into it. __________________ BUILD 2 IN PROGRESS

February 14th, 2009, 07:20 PM	#4
knightof206 Newbie 1999 mustang Cobra Join Date: Jan 2007 Location: marthasville,mo Posts: 38 iTrader: 0 reviews	also i set my tuner to show me my fuel trim in and bank 1 was always around 1.00 but bank too was always 1.20 or higher if that means anything __________________ Lowered, Magnaflow o/r X pipe, Magnaflow MagnaPack Catback, JLT CAI, Livewire Tuner

February 14th, 2009, 08:13 PM	#5
Mach Boy MM's Orangest 2004 Mach 1 Mustang Join Date: Sep 2007 Location: Indy Posts: 2,846 Blog Entries: 1 iTrader: 1 reviews	Check for an air leak on the left side near the midpipe/header connection. __________________ Looking for 03/04 4V ABS Wiring Harness Connector/Incomplete Wiring Harness (with ABS connector)

February 14th, 2009, 11:10 PM	#6
knightof206 Newbie 1999 mustang Cobra Join Date: Jan 2007 Location: marthasville,mo Posts: 38 iTrader: 0 reviews	i do have partially welded in straight pipes for Cats and i recently broken off my muffler connection from going over a hill to fast and landing. should i have my O2 connected or not? __________________ Lowered, Magnaflow o/r X pipe, Magnaflow MagnaPack Catback, JLT CAI, Livewire Tuner

February 17th, 2009, 01:07 PM	#8
knightof206 Newbie 1999 mustang Cobra Join Date: Jan 2007 Location: marthasville,mo Posts: 38 iTrader: 0 reviews	also on my tuner it shows my MAF voltage as n/a, does that mean my MAF is out or can the tuner just not detect that? __________________ Lowered, Magnaflow o/r X pipe, Magnaflow MagnaPack Catback, JLT CAI, Livewire Tuner

February 17th, 2009, 02:00 PM	#9
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,467 iTrader: 3 reviews	try using maf counts instead of voltage. __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

February 18th, 2009, 02:44 PM	#10
knightof206 Newbie 1999 mustang Cobra Join Date: Jan 2007 Location: marthasville,mo Posts: 38 iTrader: 0 reviews	i fixed it i replaced the O2's and cleaned the MAF better, it was on a open-loop config cuz after i fixed it my cars fuel trim goes from .8 to 1.2, but i cant find any information on what MAF counts are for cuz mine go from 300 to 500. __________________ Lowered, Magnaflow o/r X pipe, Magnaflow MagnaPack Catback, JLT CAI, Livewire Tuner

February 19th, 2009, 08:31 AM	#12
~C~ ~C~, The Other White Meat! Y2K YellowJacket GT ~TBD~ Join Date: Jun 2008 Location: West side B-More Posts: 1,697 iTrader: 2 reviews	After you figure out everything, I have the stock MAF if you need one. Let me know. __________________ BLOWN Bumblebeast! 370 rwhp / 381 ft lbs ~Tuned by JJ at WMS "Like the blind man says......We shall see...."

February 19th, 2009, 05:26 PM	#13
knightof206 Newbie 1999 mustang Cobra Join Date: Jan 2007 Location: marthasville,mo Posts: 38 iTrader: 0 reviews	WTF i cleaned the MAF and replaced the 02 and today it came back with p0174, it seems that my MAF is bad. ill pm about buying yours. __________________ Lowered, Magnaflow o/r X pipe, Magnaflow MagnaPack Catback, JLT CAI, Livewire Tuner

February 20th, 2009, 11:59 AM	#14
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,467 iTrader: 3 reviews	Post up a datalog before you go spending money on a maf. It could easily be the tune. __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

February 20th, 2009, 02:59 PM	#15
knightof206 Newbie 1999 mustang Cobra Join Date: Jan 2007 Location: marthasville,mo Posts: 38 iTrader: 0 reviews	my car is acting really wierd now, it shut its self down when i was coasting down hill then when i started it it up it started revving out of nowhere and when i hit the gas it would studder really bad before it took off so i returned my car to the stock tune and it seems to work fine and my check engine light was gone but on the way home it came back i checked the codes and it had p0331,p1501,p1000,p1501,p0325,p700,p0174, WTF. and the codes that is awalys there isnt theres which is the one for not having cats but my car is finally running normally but a ton of codes poped up __________________ Lowered, Magnaflow o/r X pipe, Magnaflow MagnaPack Catback, JLT CAI, Livewire Tuner

February 20th, 2009, 03:08 PM	#16
wraitherx Moderator '99 SVT Cobra Join Date: Nov 2006 Location: Virginia Beach, VA Posts: 9,568 iTrader: 11 reviews	p0331-Knock sensor 2 cirucuit range (bank 2) p0325- Knock sensor 1 malfunction (bank 1) p0174- System too lean (bank 2) p1501- Vehicle speed sensor out of self test range p1000- monitor testing not complete sounds like something with your tune, I would get it checked out ASAP. datalog it and send it towards JOE __________________ BUILD 2 IN PROGRESS

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