Ford F150 P0420 Check Engine Code P0138 code: o2 sensor circuit high voltage (bank 1, sensor 2) Sensor o2 oxygen heater p0137 heated p0138 resistance ho2s carparts p0030 causes exhaust sensor1 bank2 P0138 Code: O2 Sensor Circuit High Voltage (Bank 1, Sensor 2) - In The P0138 Code: O2 Sensor Circuit High Voltage (Bank 1, Sensor 2) - In The Check Details ← Engine Code 442 Check Engine Ford F150 P0430 Check Engine Code → Share with friends Link copied