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Ford F150 P0420: Catalyst System Efficiency → Below Threshold → Bank 1
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
Ford F150 P0420: Catalyst System Efficiency → Below Threshold → Bank 1
P0138 Code: O2 Sensor Circuit High Voltage (Bank 1, Sensor 2) - In The
P0401 Error Code - Ford Truck Enthusiasts Forums