P0056 - HO2S Heater Control Circuit Bank 2 Sensor 2

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3  What does this mean?
Possible causes
- Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 harness is open shorted
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit poor electrical connection
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit fuse
- Faulty Engine Control Module (ECM)
  What does this mean?
Tech notes
The code means that there is a problem with the heater element circuit of the heated oxygen sensor. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors.
  What does this mean?
When is the code detected?
The P0056 is set when the ECM detects an open or shorted to ground condition on the heated oxygen sensor heater circuit
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0056 Description

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).

In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.

The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.

OBDII Code P0056 - HO2S Heater Control Circuit Bank 2 Sensor 2 - AutoCodes.com
P0056 Information for specific makes
P0056 AUDI HO2S Heater Control Circuit Bank 2 Sensor 2   
P0056 BMW HO2S 22 Heater Control Circuit   
P0056 HYUNDAI HO2S 22 Heater Control Circuit Fault   
P0056 KIA HO2S 22 Heater Circuit Malfunction   
P0056 MINI HO2S 22 Heater Control Circuit   
P0056 SUBARU HO2S 22 Heater Control Circuit   
P0056 SUZUKI HO2S22 Heater Resistance Out Of Limits   
P0056 VOLKSWAGEN HO2S Heater Control Circuit Bank 2 Sensor 2   
Related Information
Repair Importance Level: 2
 
1=Low 2=Medium 3=High  
Repair Difficulty Level: 2
 
1=Easy 2=Moderate 3=Hard  
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