Troubleshooting P0125 - ECT Sensor defective
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Troubleshooting P0125 - ECT Sensor defective
Hello All,
Hope I can get a little bit of help and a lot of advise from the forum. I have a '96 Explorer XLT 4WD, 4.0 L V-6, that was diagnosed with the P0125 error code from the ODBII PCM. I bought the replacement thermostat, but am not sure which device is the ECT sensor? In looking at the assembly there is a Coolant Temperature Sending Unit, looks like a switch only, and there is a EEC-iV coolant temperature sending unit, that appears to the the thermistor or similar device. Which one in this case, if not both , would generate the P0125 error?
I'm thinking about just replacing the thermostat, and taking a chance, but since I've got it apart, should I go ahead and replace the ECTsensor(s)?
THanks for your help and thanks for the Explorer Truck Forum.
Hope I can get a little bit of help and a lot of advise from the forum. I have a '96 Explorer XLT 4WD, 4.0 L V-6, that was diagnosed with the P0125 error code from the ODBII PCM. I bought the replacement thermostat, but am not sure which device is the ECT sensor? In looking at the assembly there is a Coolant Temperature Sending Unit, looks like a switch only, and there is a EEC-iV coolant temperature sending unit, that appears to the the thermistor or similar device. Which one in this case, if not both , would generate the P0125 error?
I'm thinking about just replacing the thermostat, and taking a chance, but since I've got it apart, should I go ahead and replace the ECTsensor(s)?
THanks for your help and thanks for the Explorer Truck Forum.
Postmaster
Joined: Oct 2003
Posts: 4,516
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From: SoCal
Your Haynes or Chiltons manual will probably tell you to use a new gasket & a thin layer of RTV on both sides of the gasket.
Thats what I would do.
Be careful not to overtighten the T-stat housing so as not to break it.
Been there & done that one myself.
Thats what I would do.
Be careful not to overtighten the T-stat housing so as not to break it.
Been there & done that one myself.
Lead Driver
Joined: Aug 2006
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From: Sand Lake, MI
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Cargo Master
Joined: Aug 2003
Posts: 3,263
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From: BC Canada
Check both seating surfaces of the T-stat housing/block, if corroded/pitted, clean well and suppliment the O ring with RTV.
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Just a quick update for you guys. Replaced the T-Stat and engine temp went right up to normal. It looks as though the gas milage has improved as well, but most of all is that there is heat again to defrost the windshield on these cold mornings. Thanks 87 XLT and all the rest for your help. I'm sure that I will be back again needing help.
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