Technical Description of OBD-II Trouble Code
Generic: High Control Circuit for Oxygen (A/F) Sensor Heater (Bank 2 Sensor 1)
Nissan: Voltage of Heated oxygen sensor (HO2S) 1 Bank 2 heater is high
What does that signify?
This diagnostic trouble code (DTC) is a generic powertrain code, which means it is applicable to OBD-II equipped vehicles, including but not limited to Toyota, VW, Ford, Dodge, Honda, Chevrolet, Hyundai, Audi, Nissan, etc. The specific repair steps may vary depending on the model.
A P0052 DTC (diagnostic trouble code) refers to the O2 sensor (oxygen sensor) located on Bank 2 in front of the catalytic converter. There is also an oxygen sensor behind the converter which is Sensor #2. Bank 2 is the side of the engine that does not contain cylinder #1.
This O2 sensor #1 may also be referred to as an air/fuel ratio sensor since on some vehicles it is. The sensor detects the amount of oxygen in the exhaust gas compared to the outside air, and then the vehicle’s computer adjusts the air/fuel ratio going into the engine. The sensor is less effective when the exhaust gas temperature is low, so it includes a heater which is activated to help obtain better readings from the O2 sensor. Essentially, this P0052 code means that the resistance of the heater circuit is higher than normal. In some cases, the resistance level must be higher than 10 A to trigger the DTC code.
Note, this code is very similar in nature to P0031, P0032, and P0051
Potential Symptoms
Most likely, you will not notice any symptoms other than the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminating.
Causes
A P0052 DTC trouble code may be caused by one or more of the following:
Possible Solutions
To resolve a P0052 DTC code, you will need to perform a proper diagnosis. To do that, you will want to inspect the wiring and connectors leading to the sensor. Also, if equipped with a heater relay and fuse, you will want to check those as well. Use a digital volt ohm meter to:
Refer to a 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 is above 10 A.
With that said, a common fix for this DTC is to replace the air/fuel (O2 oxygen) sensor #2 on bank 1.
Please keep in mind that OEM (original equipment) replacement sensors are recommended (from the dealer). Aftermarket sensors can be less reliable and of poorer quality (not always, but more often). There is also a chance that replacement parts for the P0052 code may also fall under a federal emissions warranty (check with your dealer to see if it is covered).
