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1997 Toyota Corolla P0125 Code: Causes, Fixes & O2 Sensor Diagnosis

Model: 1997 Corolla Fault Code: P0125 Posted: 2014-11-12 12:13

I'm experiencing a recurring P0125 fault code on my 1997 Toyota Corolla. I've already replaced the thermostat and coolant temperature sensor, and topped up the coolant level, but the code keeps reappearing. Any suggestions or troubleshooting steps would be greatly appreciated.

Related fault codes

P0125

Comments (3)

Anonymous 2014-11-13 08:46

The P0125 code in Toyota vehicles is often misinterpreted as a cooling system issue. It's more accurately linked to an upstream oxygen (O2) sensor problem. Before replacing the O2 sensor, inspect the wiring and connectors for damage or corrosion. If replacement is needed, use dealer-grade parts rather than aftermarket components to ensure compatibility and reliability.

Anonymous 2014-11-13 10:15

Thanks for the insight — I'll try this approach and update with my results once I've tested it out.

Anonymous 2021-01-18 15:35

Hola buen día amigo caballero desearia saber que hacer con ese código p0125 pues yo ya cambie el sensor y solo duró un tiempo no más ahora veo no sirve y lo enciende de nuevo ese código seguido además saber si tienen el diagrama del sensor o1 pues veo no manda señal al scannear de que existe ayuda por favor