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Low Coolant Temp Code PO125

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Old 10-23-2008, 06:48 PM   #1
Jacksonville, FL
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Low Coolant Temp Code PO125

Well the other day the check engine light came on when my wife was driving. Its a 96 Explorer 2 wheel drive with a V-6. I was in it a few days ago and thought the temperature guage was reading low. I got a code reader and got code "PO125" that reads that the coolant temperature was too low for the closed fuel loop, or something close to that.

I thought it must be a thermastat was stuck open or maybe the fan clutch isn't disengaging. I'll be looking at those things tonight. Have you dealt with this situation or have any other ideas? THANKS!!!
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Old 10-23-2008, 07:02 PM   #2
Evil Asian
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It could be a variety of things.. Try searching P0125 in the search tab and see what you come up with. Off the top of my head, I'm thinking either a open thermostat, maybe a sensor issue for coolant.
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Old 10-24-2008, 10:07 AM   #3
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If the gauge reads low too, chances are the code is accurate. There should be two different sensors for for the gauge and one for the ECM. Sounds like both are reading low. I'm betting on a thermostat. You should have a 195 degree stat in there...and make sure it's a good quality one. Don't go with a cheapie from Autozone or Checker.

Another good check is to turn your heater on max heat and see how hot the air is. If it's not very hot, then that tells you the coolant isn't hot either.


Originally Posted by four0sport
she is a girl, there are no answers, only more questions!
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Old 10-24-2008, 10:18 AM   #4
balt, md
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When you get the T-stat, make sure you also get a gasket. Some of them don't necessarily include it.

'88 F150 4x4
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If it don't = 16 (4x4), it ain't worth driving...
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