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P0125 Toyota - Replaced all recommended part-light still on.

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My check engine light is on with a P0125 code. I've replaced the thermostat, coolant temp sensor and the coolant is new and all the way to the top. I've had the light turned off, but it comes back on after about 2 miles driving. What else could be wrong?

Vehicle: 1996 Toyota Corolla (base model) 1.6 L

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This year and model the code is for Oxygen sensor if the EFI relay or ECU is not bad 

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