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  #1  
Old 02-03-2009, 07:12 PM
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OBD Code PO125

2000 Expedition, 4.6L Windsor is throwing code PO125- "Insufficient coolant temp for closed loop fuel control." The engine itself eventually warms up, but the temp guage never moves. Is this just a sensor malfunction?
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Old 02-03-2009, 07:18 PM
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You need a new thermostat.
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Old 02-04-2009, 08:32 AM
Eddie Hudson Eddie Hudson is offline
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Quote:
Originally Posted by texastech_diesel View Post
2000 Expedition, 4.6L Windsor is throwing code PO125- "Insufficient coolant temp for closed loop fuel control." The engine itself eventually warms up, but the temp guage never moves. Is this just a sensor malfunction?
The same thing happened to my 5.4L. The engine temperature would never get above 167 degrees in the winter and I got the same code. I installed a new thermostat and now I'm nice and warm with an engine temperature of 192.
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Old 02-04-2009, 10:30 AM
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Smae thing hapened to mine, installed a new tstat and everything is good now.
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Old 02-02-2010, 10:06 PM
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I'm having the same as many here. The PO125 code popped and my ALLDATA wants my to trouble shoot pages worth of wires and harnesses. So the masses here say remove and replace thermostat and I should be OK...RIGHT?!? I have the 5.4L F150 with about 105K. PLEASE HELP my baby.
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Old 02-03-2010, 06:10 AM
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Come back AFTER you've followed the recommendations....
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Old 02-03-2010, 07:20 AM
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is your truck warming up? or is it just the gauge that's not moving?
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Old 02-03-2010, 07:41 AM
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I can say it's warmed up. I was traveling home from work 20 minutes on the I15 when it came on. I did notice the temp gauge alittle lower than normal.
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Old 02-03-2010, 08:08 AM
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was it blowing warm before the gauge started working? trying to figure out if it's your t-stat or your temp sender
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Old 02-03-2010, 07:38 PM
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It's not the sender. It's a failure of the engine to reach operating temp within the allotted time.
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Old 02-03-2010, 07:43 PM
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if the sender was not working then the pcm wouldn't know when the engine got to temp
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Old 02-04-2010, 12:55 AM
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No it don't blow hot air right away, but warmed up before the gauge moved. But when selected to warm it blows hot air and cool when in cool.
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Old 02-04-2010, 06:21 AM
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Question

Quote:
Originally Posted by djusino View Post
I'm having the same as many here. The PO125 code popped and my ALLDATA wants my to trouble shoot pages worth of wires and harnesses. So the masses here say remove and replace thermostat and I should be OK...RIGHT?!? I have the 5.4L F150 with about 105K. PLEASE HELP my baby.
Did you change the thermostat yet?
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Old 02-04-2010, 06:34 AM
projectSHO89 projectSHO89 is offline
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Originally Posted by fordtech08 View Post
if the sender was not working then the pcm wouldn't know when the engine got to temp
The problem code is due to the engine not warming up as fast as it should.

When you find one of these trucks where the ECT or the CHT is responsible for this code instead of low coolant or a leaky/stuck open thermostat, you let us know.

This is a simple and inexpensive repair. Just go do it.
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Old 02-04-2010, 08:12 AM
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Quote:
Originally Posted by projectSHO89 View Post
The problem code is due to the engine not warming up as fast as it should.

When you find one of these trucks where the ECT or the CHT is responsible for this code instead of low coolant or a leaky/stuck open thermostat, you let us know.

This is a simple and inexpensive repair. Just go do it.
this is out of fords workshop manual, I guess you never bother to get to the bottom of the list

Diagnostic Trouble Code (DTC) P0125 indicates the CHT sensor has not achieved the required temperature level to enter closed loop operating conditions within a specified amount of time after starting engine. This DTC will light the MIL.
Possible causes:
  • Insufficient warm up time.
  • Leaky or stuck open thermostat.
  • Low engine coolant level.
  • Malfunctioning CHT sensor.
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Old 02-04-2010, 08:12 AM
 
 
 
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