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Got a code PO125 today?

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Old 02-05-2007, 10:49 PM
Fredster Fredster is offline
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Got a code PO125 today?

I have a 2000 F-150 5.4L. Got a code Po125 today. Eng. service light is on.
Autozone says it means the pcm has determined that the amount of time it took for the coolant temperture sensor to reach an input value consistent with closed loop operation was to excessive. Can anyone tell me what to check for?
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Old 02-06-2007, 01:17 AM
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It means the engine isn't warming up fast enough. Either the thermostat isn't closing completely or the temp sensor is bad.
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Old 02-06-2007, 08:37 AM
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Where is the temp. sensor on a 5.4? I could not find it.
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Old 02-06-2007, 09:18 AM
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There is one sensor on the drivers side head in front of the #5 intake port. I'm not sure if this one measures coolant temp or the head temp for the gauge.
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Old 02-07-2007, 08:44 AM
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I cleared the code without doing anything. So far it hasn't came back.
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Old 02-07-2007, 09:12 AM
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Perhaps the thermostat stuck open one time. Might not be a bad idea to change it just to be sure it doesn't stick again if it did. Sticking closed would be worse that sticking open.
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Old 02-07-2007, 09:18 AM
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Time for a new thermostat. Replace it now before it causes further problems of a more serious nature.

Steve
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Old 02-07-2007, 09:05 PM
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I plan on flushing the cooling sys. soon anyway. I will change the thermostat at the same time. Thanks
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