P0052 - Oxygen Sensor (A/F) Heater Control Circuit High (Bank 2 Sensor 1)

P0052 - Oxygen Sensor (A/F) Heater Control Circuit High (Bank 2 Sensor 1)

OBD-II DTC Datasheet

Common: Oxygen Sensor (A/F) Heater Control Circuit High (Bank 2 Sensor 1) Nissan Heated Oxygen Sensor (HO2S) 1 Bank 2 - Heater Voltage High

What does this mean?

This Diagnostic Trouble Code (DTC) is a generic transmission code, which means it applies to OBD-II equipped vehicles including but not limited to Toyota, VW, Ford, Dodge, Honda, Chevrolet, Hyundai, Audi, Nissan, etc. E. Specific repair steps may vary depending on the model.

DTC P0052 (Diagnostic Trouble Code) refers to the O2 sensor (oxygen sensor) located on Bank 2 before the catalytic converter. Behind the transducer is also an oxygen sensor, which is the #2 sensor. Bank 2 is the side of the engine that does not have cylinder #1.

This # 2 O1 sensor may also be referred to as an air / fuel ratio sensor as it is on some vehicles. A sensor detects the amount of oxygen in the exhaust compared to outside air, and then the car's computer adjusts the air / fuel ratio to the engine. The sensor is less effective at low exhaust temperatures, so it includes a heater that activates to get the best O2 sensor readings. Basically, this P0052 code means that the resistance of the heater circuit is higher than usual. In some cases, this resistance level must be higher than 10A for the DTC to be triggered.

Please note that this code is very similar in nature to P0031, P0032, and P0051.

Possible symptoms

Most likely you will not notice any symptoms other than the malfunction indicator lamp (check engine lamp) comes on.

reasons

The P0052 DTC can be caused by one or more of the following:

• Short circuit in the heater circuit in the sensor
• Defective O2 sensor heater
• Broken / worn wiring / connectors to sensor and / or relay
• Defective PCM / ECM

Possible solutions

To fix the P0052 DTC, you need to run proper diagnostics. To do this, you need to inspect the wiring and connectors leading to the sensor. Also, if you have a heater relay and fuse, you will want to test them as well. Use a digital volt-ohmmeter to:

• check for 12 volts on the heater circuit power (hint: disconnect the sensor and check the wiring connector to take this measurement)
• check the ground circuit for continuity
• measure the resistance of the heater circuit (done on the sensor itself)
• measure the resistance and voltage of the wiring

Refer to your service manual for the correct specifications (volts, ohms) for your vehicle. On some Toyota vehicles, this code is triggered when the resistance of the heater circuit exceeds 10 A.

With that said, the usual solution for this DTC is to replace the # 2 Air / Fuel (O2, Oxygen) sensor on Bank 1.

Note that replacement of OEM sensors (original equipment) is recommended (by dealer). Aftermarket sensors may be less reliable and of lower quality (not always, but more often). There is also the possibility that parts code P0052 may also be eligible for a federal emissions guarantee (check with your dealer if this applies).

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