Circuit Description

NOTE:

Bank No. 1 refers to bank that includes cylinder No. 1.
Sensor No. 1 refers to sensor closer to engine body.
The oxygen sensor's output voltage and short-term fuel trim value can be read using hand-held tester or OBD II scan tool.

For circuit description, see DTC P0125: INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP FUEL CONTROL . Detecting condition of DTC is when voltage output of oxygen sensor remains at 0.4 V or more, or 0.55 V or less, during idling after engine is warmed up (2 trip detection logic).