ES - 1st to 4th Gen (1990-2006) Forum for all 1990 - 2006 ES300 and ES330 models. ES250 topics go here as well.

Please help P0125 code

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Old 10-16-12, 06:19 PM
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encore63
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Default Please help P0125 code

Does anybody know? I changed the thermostat and erased the code, drove for 5 minutes. The engine light is now on with the same code.
Old 10-17-12, 04:45 PM
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encore63
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Default 1999 ES300 (p0125 code) please help

Does anyone know much about this code? I changed the thermostat, checked the coolant and erase the code and drove about 5 miles, the check engine light come on again with the same code.
Old 10-17-12, 05:49 PM
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hzt30
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Did you use a OEM thermostat with correct degree rating?... NEVER NEVER use lower rated T'stats

Is the engine getting up to normal operating temperature? If it is then you may have a bad coolant temperature sensor. If you have a scanner you can read the ECT that the PCM is recieving from the ECT sensor.

Another possibility could be a flakey O2 sensor. You can read the values of the O2 sensors with a scan tool.
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