P0056 HO2S Heater Control Circuit Bank 2 Sensor 2

Definition: OBD-II Code P0056 is defined as a Heated Oxygen Sensor (HO2S) Heater Control Circuit Bank 2 Sensor 2. This code indicates that there is an issue with the heater control circuit of the oxygen sensor located on bank 2, sensor 2.

p0056: HO2S Heater Control Circuit Bank 2 Sensor 2

Typical Severity: Moderate

Common Causes

P0056 – HO2S Heater Control Circuit Bank 2 Sensor 2

Common causes of this OBD2 code include:

• Faulty oxygen sensor
• Open or short in the wiring harness to the sensor
• Poor electrical connection at the sensor
• Faulty PCM (Powertrain Control Module)

Common Misdiagnosis

OBD2 Code: P0056

Description: HO2S Heater Control Circuit Bank 2 Sensor 2

Common Misdiagnosis: Replacing the oxygen sensor without checking for issues in the wiring or heater circuit, such as blown fuses or poor electrical connections.

Common Diagnostic Steps

OBD2 Code: P0056

Description: HO2S Heater Control Circuit Bank 2 Sensor 2

• Check the oxygen sensor heater circuit fuse and replace if necessary.
• Inspect the wiring and connectors for damage or corrosion. Repair or replace as needed.
• Test the voltage at the oxygen sensor connector to ensure it is within specifications.
• Measure the resistance of the oxygen sensor heater element; compare with manufacturer specifications.
• If applicable, use a scan tool to monitor the operation of the heater circuit while performing a wiggle test on related wiring.
• Replace the oxygen sensor if all other components are functioning correctly but the code persists.