P0052 - HO2S HEATER CONTROL CIRCUIT HIGH (BANK 2 SENSOR 1)

Diagnostic code P0052 OBD2 refers to the Oxygen Sensor which is located in bank number 2 on the ahead of the catalyst. It should be noted that there is also an O2 (Oxygen Sensor) located on the back of the catalytic converter, but this corresponds to Sensor number 2, bank 2. This Oxygen Sensor (O2) number 1 is also known like an air/fuel ratio sensor, because in some vehicles this is the case.

The function is to detect the oxygen portion in the exhaust gas, in order to compare it to the outside air. This information is then sent to the PCM (Powertrain Control Module) who set the air/fuel ratio entering the engine. The function of this sensor is affected when the temperature of the exhaust gases is low, for this reason this sensor is equipped with a heating element and is activated in order to provide help and, in this way, better readings are obtained from the O2 sensor (Oxygen Sensor).

The DTC code means that the resistance of the heater circuit is above the expected level. In some cases, that resistance level exceeds 10 A to establish the code.

• Check Engine light's on.
• The fuel economy of the vehicle may be affected, being less than normal.

The problems that can lead to the establishment of the fault code P0052 can be the following:

• There may be a short in the heating element circuit of the Oxygen (O2) Sensor.
• The Oxygen Sensor (O2) heating element may be defective.
• The cables and their respective connectors leading to the Oxygen Sensor may be worn or corroded.

To fix DTC code P0052 you can review the following components:

• Check all connectors and cables leading to the Oxygen Sensor (O2). Also, those that lead to the relay in case your vehicle owns it.
• Using a digital voltmeter, check that there is 12 volts of power in the circuit f the heater. To do this you can disconnect the sensor, and verify the connector of the cables to make this measurement. Also make sure to ascertain the ground in the circuit and see if there is continuity of the resistance of the circuit of the heating element. Compare all these readings to the vehicle specifications. If you find inconsistency in any of these, repair it.
• You can change the Oxygen (O2) Sensor.