Codes P1000 P0171 P0174 Please Help!!!

JerseyTrueBlue · June 9th, 2009, 01:49 PM

I have no idea why I am pulling these codes I'm throwing a P1000 OBD system test not complete? and P0171 and P0174 System too lean bank 1 and bank 2. Can anyone dumb this down for me? I have to get my car running right it's my only vehicle and I just put in a brand new motor I can't afford to f it up. I've checked all my hoses everything is fine and connected properly I'm getting an exhaust leak taken care of tomorrow I don't know what else could be causing this I'm seriously so fed up I wanna drive it off a cliff. I had none of these problems before a spent a few grand on a new motor, is it because I'm running my old ecu? Does that even matter? Should I take it to a dyno shop and let them tune it? Please any advice is greatly appreciated.

Black Bullitt · June 9th, 2009, 02:25 PM

Where is your exhaust leak at? If it's near the front it might throw those codes. I'm not for certain though.

Quick99 · June 9th, 2009, 04:35 PM

Fix your exhaust leak first. Try cleaning your MAF sensor and check for vacuum leaks.

JerseyTrueBlue · June 9th, 2009, 05:52 PM

I checked all my vacuum hoses the maf is brand new the exhaust leak is somewhere by the mid pipe im not exactly sure where

GTRACER88 · June 9th, 2009, 06:11 PM

That is caused by bad reading from your O2 sensors. Either your sensors failed or the exhaust leak is causing the system to read bad.

neverfastenough1 · June 9th, 2009, 11:19 PM

Originally Posted by GTRACER88

That is caused by bad reading from your O2 sensors. Either your sensors failed or the exhaust leak is causing the system to read bad.

I don't think it is very often that both sensors go bad at the same time, but I guess they could.

JerseyTrueBlue · June 10th, 2009, 08:57 AM

It wasn't the leak or the sensors I'm running out of options anyone else have any ideas? Vacuum leaks sensors and exhaust all checked what could it be!? Will a new tune help?

Trick Tuners · June 10th, 2009, 12:16 PM

Originally Posted by JerseyTrueBlue

Will a new tune help?

not if you are on the stock tune. If you have an aftermarket tune you need to contact your tuner and have him fix your tune.

GTRACER88 · June 10th, 2009, 06:51 PM

Do you have cats? Check to see if they are clogged.

GTRACER88 · June 10th, 2009, 06:52 PM

Originally Posted by neverfastenough1

I don't think it is very often that both sensors go bad at the same time, but I guess they could.

I got both codes but only changed my drivers side O2 sensor and the problem was fixed. Saved $40 on a second O2.

JerseyTrueBlue · June 11th, 2009, 08:32 AM

It's broken down to this, someone at svt told me that if I'm running the old ecu I have to run my old wire harness which I did not know. Supposedly if you don't change the harness the computer won't even act like you changed the motor. Anyway if this works it will be a miracle sorry for making you all guestimate at what was causing these codes if this doesn't change anything I'll try your other suggestions thank you again.

neverfastenough1 · June 11th, 2009, 10:01 AM

Did you just start it and run codes, or did you let it warm up first? Just asking. Has to be a certain temp I believe in order to complete the test. Hopefully it is corrected with the harness.

JerseyTrueBlue · June 15th, 2009, 04:36 AM

It was always warmed up

June 9th, 2009, 01:49 PM	#1
JerseyTrueBlue Hardcore Enthusiast 2001 Mustang GT Join Date: Mar 2009 Location: New Jersey Posts: 1,857 iTrader: 3 reviews	Codes P1000 P0171 P0174 Please Help!!! I have no idea why I am pulling these codes I'm throwing a P1000 OBD system test not complete? and P0171 and P0174 System too lean bank 1 and bank 2. Can anyone dumb this down for me? I have to get my car running right it's my only vehicle and I just put in a brand new motor I can't afford to f it up. I've checked all my hoses everything is fine and connected properly I'm getting an exhaust leak taken care of tomorrow I don't know what else could be causing this I'm seriously so fed up I wanna drive it off a cliff. I had none of these problems before a spent a few grand on a new motor, is it because I'm running my old ecu? Does that even matter? Should I take it to a dyno shop and let them tune it? Please any advice is greatly appreciated.

June 9th, 2009, 06:11 PM	#5
GTRACER88 I'm cool.. Join Date: May 2008 Location: Houston, TX Posts: 2,165 iTrader: 1 reviews	That is caused by bad reading from your O2 sensors. Either your sensors failed or the exhaust leak is causing the system to read bad. __________________ Super Slow 2012 Grabber blue 5.0...

June 10th, 2009, 06:51 PM	#9
GTRACER88 I'm cool.. Join Date: May 2008 Location: Houston, TX Posts: 2,165 iTrader: 1 reviews	Do you have cats? Check to see if they are clogged. __________________ Super Slow 2012 Grabber blue 5.0...

June 11th, 2009, 10:01 AM	#12
neverfastenough1 Hardcore Enthusiast 2002 Mustang GT Join Date: May 2007 Location: Savannah, Ga Posts: 2,789 iTrader: 3 reviews	Did you just start it and run codes, or did you let it warm up first? Just asking. Has to be a certain temp I believe in order to complete the test. Hopefully it is corrected with the harness. __________________

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June 9th, 2009, 04:35 PM	#3
Quick99 Regular 1999 Mustang GT ? Join Date: May 2008 Location: Fullerton CA Posts: 354 iTrader: 0 reviews	Fix your exhaust leak first. Try cleaning your MAF sensor and check for vacuum leaks.

June 9th, 2009, 05:52 PM	#4
JerseyTrueBlue Hardcore Enthusiast 2001 Mustang GT Join Date: Mar 2009 Location: New Jersey Posts: 1,857 iTrader: 3 reviews	I checked all my vacuum hoses the maf is brand new the exhaust leak is somewhere by the mid pipe im not exactly sure where

June 10th, 2009, 08:57 AM	#7
JerseyTrueBlue Hardcore Enthusiast 2001 Mustang GT Join Date: Mar 2009 Location: New Jersey Posts: 1,857 iTrader: 3 reviews	It wasn't the leak or the sensors I'm running out of options anyone else have any ideas? Vacuum leaks sensors and exhaust all checked what could it be!? Will a new tune help?

June 11th, 2009, 08:32 AM	#11
JerseyTrueBlue Hardcore Enthusiast 2001 Mustang GT Join Date: Mar 2009 Location: New Jersey Posts: 1,857 iTrader: 3 reviews	It's broken down to this, someone at svt told me that if I'm running the old ecu I have to run my old wire harness which I did not know. Supposedly if you don't change the harness the computer won't even act like you changed the motor. Anyway if this works it will be a miracle sorry for making you all guestimate at what was causing these codes if this doesn't change anything I'll try your other suggestions thank you again.

June 15th, 2009, 04:36 AM	#13
JerseyTrueBlue Hardcore Enthusiast 2001 Mustang GT Join Date: Mar 2009 Location: New Jersey Posts: 1,857 iTrader: 3 reviews	It was always warmed up

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