If you have a fault code for an O2 heater circuit failure on one of ... the questions I am asked most often about O2 sensors is how do you know what is Bank 1 or Bank 2, which O2 sensor is Sensor ...

P0138 – O2 Sensor Circuit High Voltage Bank 1 Sensor 2: The HO2S (Rear O2 Sensor), after three-way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank.

Answer:DTC P0052 refers to a failure of the oxygen sensor heater control circuit -- Bank 2, Sensor 1.The O2 sensor is most accurate in determining oxygen content in the exhaust gases at a certain ...

P0135 – O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1: Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an ...