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P0138 OBD-II Trouble Codes: O2 Sensor Circuit High Voltage (Bank 1, Sensor 2)
P0138 code definition O2 Sensor Circuit High Voltage (Bank 1, Sensor 2) What the P0138 code means P0138 is the OBD-II generic code indicating the O2 sensor for bank 1 sensor...

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Getting a check engine light, P0138 error: "O2 Sensor circuit High voltage (Bank 1, sensor 2)"
Hi, thanks for writing in. I wouldn't worry about it. The only purpose of the downstream O2 sensor is to monitor the health of the catalytic converter. You have four O2 sensors. The two upstream sensors monitor fuel mixture (Bank...

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