P0167 O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 3

OBD-II Code P0167: This code indicates that there is a malfunction in the heater circuit of the oxygen sensor located on bank 2, sensor 3. The oxygen sensor’s heater circuit helps bring the sensor up to operating temperature quickly for accurate readings.

p0167 – O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 3

Severity: Moderate

Common Causes

p0167 – O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 3

Common Causes:

• Faulty oxygen sensor heater circuit
• Open or short in the wiring harness connected to the oxygen sensor
• Poor electrical connection at the oxygen sensor
• Corrosion in the oxygen sensor connector
• Faulty Engine Control Module (ECM)

 

Common Misdiagnosis

OBD2 Code: P0167

Description: O2 Sensor Heater Circuit Malfunction (Bank 2, Sensor 3)

Common Misdiagnosis: Replacing the oxygen sensor without checking for issues in the heater circuit wiring or fuse.

 

Common Diagnostic Steps

OBD2 Code: P0167

Description: O2 Sensor Heater Circuit Malfunction (Bank 2, Sensor 3)

Common Diagnostic Steps:

• Check the oxygen sensor heater circuit fuse and replace if blown.
• Inspect the wiring and connectors for damage or corrosion in the heater circuit of Bank 2, Sensor 3.
• Test the voltage supply to the oxygen sensor heater using a multimeter.
• Measure the resistance of the oxygen sensor heater element; compare it with manufacturer specifications.
• If applicable, check for any related Technical Service Bulletins (TSBs) from the vehicle manufacturer.
• Replace the oxygen sensor if all other components are functioning correctly but code persists.