Ford P0056 OBD-II Trouble Code Definition:
P0056 HO2S Heater Control Circuit Bank 2 Sensor 2
P0056 Ford OBD-II Trouble CodeDescription:
OBD Trouble Code P0056
HO2S Heater Control Circuit
What does the code mean? OBD-ii Code P0056 definition:
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.
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.
Symptoms Sumptoms of OBD code P0056
– Engine Light ON (or Service Engine Soon Warning Light)
– Engine Light ON (or Service Engine Soon Warning Light)
Causes Causes of the OBD-II code P0056
– Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit open shorted to ground – Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit poor electrical connection – Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit – Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit fuse – Faulty Engine Control Module (ECM) The Error code is generally activated on detection of the following conditions: The P0056 is set when the ECM detects an open or shorted to ground condition on the heated oxygen sensor heater circuit
– Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit open shorted to ground – Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit poor electrical connection – Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit – Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit fuse – Faulty Engine Control Module (ECM) The Error code is generally activated on detection of the following conditions: The P0056 is set when the ECM detects an open or shorted to ground condition on the heated oxygen sensor heater circuit
Solutions 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. HO2S Heater Control Circuit Bank 2 Sensor 2 is the generic definition for the P0056; however your vehicle’s manufacturer may have a different definition and information for the P0056 code.