
I spilled BG 44K fuel system cleaner before replacing the sensor. Code changed from P0136 O2 Circuit (Bank 1 Sensor 2 - Firewall Side of Toyota Sienna 09 Engine) to P0031 Heater Control Circuit Low (Bank 1 Sensor 1, Firewall Side Before Catalytic Converter). I unplugged the sensor connector and tested the heater circuit by setting the multimeter to ohms and it showed an open. Sensor ordered and installed. I reset the code and it didn't come back. Saved over $40 compared to the parts store.

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