P0138 – O2 Circuit High Voltage (Bank 1, Sensor 2)

P0138 – O2 Circuit High Voltage (Bank 1, Sensor 2)
P0137 – O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
Description:         The powertrain control module (PCM) monitors the heated oxygen sensor (HO2S) for a circuit concern. This DTC sets when the PCM detects a concern with the circuit used to determine the oxygen content in the exhaust gas.
Possible Causes:       
 
HO2S circuit open
 
HO2S circuit short to ground
 
Damaged HO2S sensor
Diagnostic Aids:
Related Topics  P0106 - Manifold Absolute Pressure (MAP/BARO) Sensor Range/Performance

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