Toyota Corolla (E120): Oxygen sensor circuit malfunction

Dtc p0136 oxygen sensor circuit malfunction (bank 1 sensor 2)

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Circuit description
When the ignition switch is turned on, battery positive voltage is applied to the coilwhich closes the contacts of the efi main relay (marked: efi) and supplies power to terminal +b of the ecm. This signal causes current to flow to the coil, closing the contacts of the efi relay and supplyin ...