P0057 HO2S Heater Control Circuit Low (Bank 2 Sensor 2)
OBD-II Trouble Code Technical Description
Generic: HO2S Heater Control Circuit Low (Bank 2 Sensor 2)
Nissan: Heated oxygen sensor (HO2S) 2 Bank 2 – heater voltage low
What does that mean?
This code is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model.
For Nissan vehicles, the description is just slightly different, it’s listed as Heated oxygen sensor (HO2S) 2 Bank 2 – heater voltage low.
Heated Oxygen sensors (HO2S) are inputs used by the PCM (Powertrain Control Module) to determine oxygen content in the exhaust system. Bank 2, sensor 2 refers to the second sensor back on Bank 2. The PCM uses the information gained from the Bank 2,2 HO2S mainly to monitor the efficiency of the catalytic converter. Integral to this sensor is a heater element
The PCM controls this heater to warm up the sensor to operating temperature. This allows the engine to enter closed loop faster and reduces emissions on cold startup. The PCM continuously monitors the heater circuits for abnormal voltages or in some cases, even amperages. Depending on the make of vehicle, the Oxygen sensor heater is controlled one of two ways. One way is that the PCM directly controls the voltage feed to the heater either directly or via a HO2S relay and a ground is supplied from the vehicle’s common ground. The other way would be a fused 12 volt Battery feed (B+) that feeds 12 volts to the heater element anytime the ignition is on and the control of the heater is done by a driver in the PCM which controls the ground side of the heater circuit.
Finding out which one you have is important because the PCM activates the heater under various circumstances. If the PCM detects an abnormally low voltage condition on the heater circuit, P0057 may set. Bank 2 is the side of the engine that does not contain cylinder #1.
Symptoms
Symptoms of a P0057 DTC may include:
Causes
Potential causes of a P0057 trouble code may include:
Possible Solutions
Do a visual inspection of the Bank 2,2 HO2S and wiring harness. If there is any damage to the sensor or any damage to the wiring, repair/replace as needed. Make sure wiring is routed away from exhaust. If all appears okay, unplug the Bank 2,2 HO2S and verify that there is 12 volts B+ present with the key on engine off, (or ground is present, depending on the system).
Verify the heater control (ground) circuit is intact. If so, remove the o2 sensor and inspect for damage. If you have access to resistance specifications you can use a Ohmmeter to perform a resistance test of the heater element. Infinite resistance indicates an open in the heater. Replace the o2 sensor as necessary.
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"Delete Error Code Permanently, Disable DTC Error Code Function for p0057 in the ECU"
In extreme cases, we even have the option to permanently remove the specific DTC p0057 and disable the function of the specific error code in the ECU. All other fault code functions will then continue to work to protect the engine. This is different from clearing an error code with a diagnostic device. We have the option to permanently remove the function of the specific error code, so that it never comes back. Also emergency running that occurs on the specific error code can be solved in most cases.
Of course we prefer to first try to solve the cause of the error code, but sometimes the only solution is to permanently disable the DTC function of p0057.
