head start on P0172 and P0175

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  #1  
Old 09-04-07, 01:30 PM
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head start on P0172 and P0175

2002 Ford Taurus 3.0L flex fuel engine.

I'm going out to get more information in a little bit but here is what I have so far. My parents are down from the north and have been running E85 exclusively for a while. On this trip they have been using 'regular' gas. Emission light came on when they got here but we were on the way 2 hrs down the road. Engine stumbled a little at idle and a slight miss from time to time but otherwise ok. Got back yesterday, I hooked up my scan tool and found P0172 and P0175 (fuel trim system rich bank 1 and 2). I'm thinking MAF or MAP (whatever it is) since it set both codes at once so I sprayed some cleaner on the sensor wires. Air filter is new. Light stayed off in the driveway, I put it in reverse and it came on and is still on but I haven't hooked it back up yet.

Are there any readings I can provide to help diagnose this problem? I don't want them to get down the road into a 13 hour trip home and something fail.
 
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  #2  
Old 09-04-07, 02:23 PM
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Ford Taurus

I hope you find what the problem is and fix it
 

Last edited by slickshift; 09-07-07 at 05:53 AM. Reason: removed nonhelpful comments
  #3  
Old 09-05-07, 08:23 PM
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Reset the light after the cleaning and it came back. Here is the freeze frame if anyone has any ideas:
DTC that caused freeze frame data storage : P0172 (P0175 pending)
fuel system 1 status : closed loop
fuel system 2 status : n/a
calculated load value : 53.7%
coolant temp : 181
short term fuel trim bank 1 : -10.9
short term fuel trim bank 3 : -92.2
long term fuel trim bank 1 : -18.0
long term fuel trim bank 3 : 5.5
short term fuel trim bank 2 : -11.7
short term fuel trim bank 4 : -71.9
long term fuel trim bank 2 : -15.6
long term fuel trim bank 4 : 80.5
fuel rail pressure (gauge) : 57.9
engine rpm : 1210
vehicle speed sensor : 7
 
  #4  
Old 09-06-07, 08:32 PM
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With those codes it could be any of the following: MAP sensor, oxygen sensor, throttle position sensor, fuel filter or fuel pressure regulator.
 
  #5  
Old 09-07-07, 06:01 AM
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If you fixed it by cleaning the MAF sensor (the sensor, not just the screen), then the light may take a while to go away (on/off cycles)
Or you can reset it with your scanner and see if it comes back

As mentioned, it could be a lot of things
 
  #6  
Old 09-07-07, 01:24 PM
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You can also disconnect your negative (-) battery cable for about 30 minutes. That will reset all of the codes.
 
  #7  
Old 09-07-07, 07:01 PM
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not to be picky but....

Disconnecting the battery will not reset the codes on a 2002 Ford Taurus
A 1992 it would, not this one
 
  #8  
Old 09-08-07, 11:00 AM
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Originally Posted by slickshift View Post
Disconnecting the battery will not reset the codes on a 2002 Ford Taurus
A 1992 it would, not this one
I did not know that. I am a Mopar man myself and it still works on all the current year Mopars. Sorry for the misinformation.
 
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