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P0167 – Heated Oxygen Sensor (HO2S) Heater Circuit (Bank 2 Sensor 3)
P0167 is a generic OBD-II Diagnostic Trouble Code (DTC) that indicates the Engine Control Module (ECM) has detected a malfunction in the heater circuit of the Heated Oxygen Sensor (HO2S) located at Bank 2 Sensor 3. This oxygen sensor is typically installed after the catalytic converter on the engine bank that does not contain cylinder number one. The built-in heater allows the oxygen sensor to reach its operating temperature quickly, ensuring accurate emissions monitoring. If the heater circuit fails to operate properly, the ECM stores the P0167 code and illuminates the Check Engine Light.
What Does P0167 Mean?
Bank 2 Sensor 3 refers to the third oxygen sensor on the engine bank opposite cylinder number one. This sensor is found on vehicles equipped with multiple catalytic converters or advanced exhaust systems.
The oxygen sensor includes an internal heating element that rapidly warms the sensor after engine startup. If the ECM detects an open circuit, short circuit, or abnormal resistance in the heater circuit, it sets the P0167 diagnostic trouble code.
Symptoms of P0167 Code
If your vehicle has a stored P0167 code, you may experience one or more of the following symptoms:
- Check Engine Light is ON
- Failed emissions inspection
- Increased exhaust emissions
- Delayed oxygen sensor operation
- Slight decrease in fuel economy
- Longer warm-up time for the emissions system
- In most cases, no noticeable drivability issues
Common Causes of P0167
Several issues can trigger the P0167 trouble code, including:
- Faulty Bank 2 Sensor 3 oxygen sensor
- Failed heater element inside the oxygen sensor
- Blown oxygen sensor heater fuse
- Damaged or broken wiring
- Loose or corroded electrical connector
- Open or short circuit in the heater circuit
- Poor ground connection
- Engine Control Module (ECM) failure (rare)
How to Diagnose P0167
A systematic diagnosis helps identify the exact cause of the problem.
Step 1: Confirm the Trouble Code
Use an OBD-II scanner to verify that the P0167 code is stored. Check for additional oxygen sensor or heater circuit-related codes.
Step 2: Inspect the Oxygen Sensor
Visually inspect Bank 2 Sensor 3 for signs of physical damage, contamination, or overheating.
Step 3: Inspect Wiring and Connector
Check the wiring harness and connector for broken wires, melted insulation, corrosion, or loose terminals.
Step 4: Check the Heater Fuse
Inspect the oxygen sensor heater fuse and replace it if necessary.
Step 5: Test the Heater Circuit
Use a digital multimeter to measure the heater element resistance and compare it with the manufacturer's specifications.
Step 6: Verify Power and Ground
Check that the heater circuit receives battery voltage and has a proper ground connection.
How to Fix P0167
Depending on the diagnosis, one or more of the following repairs may solve the problem:
- Replace the faulty Bank 2 Sensor 3 oxygen sensor
- Repair damaged wiring or connectors
- Replace the blown heater fuse
- Repair an open or shorted heater circuit
- Clean corroded electrical terminals
- Clear the diagnostic code and perform a road test
- Replace the ECM only if all other components have been thoroughly tested
Can You Drive with P0167?
Yes, the vehicle can usually still be driven safely. However, delaying repairs may increase exhaust emissions, reduce fuel efficiency, and prevent the emissions system from operating correctly during cold starts. Prompt repair is recommended.
Estimated Repair Cost
| Repair | Estimated Cost (USD) |
|---|---|
| Oxygen Sensor Replacement | $100 – $350 |
| Wiring Repair | $50 – $250 |
| Heater Fuse Replacement | $10 – $50 |
| Electrical Connector Repair | $30 – $150 |
| ECM Replacement (Rare) | $500 – $1,500 |
Repair costs vary depending on the vehicle make, model, labor rates, and geographic location.
Frequently Asked Questions (FAQs)
Is P0167 a serious trouble code?
P0167 is considered a moderate fault. It usually does not affect vehicle drivability, but it can increase emissions and may cause the vehicle to fail an emissions inspection.
Can a faulty oxygen sensor cause P0167?
Yes. A failed heater element inside the Bank 2 Sensor 3 oxygen sensor is the most common cause of this code.
Can a blown fuse trigger P0167?
Yes. If the oxygen sensor heater fuse is blown, the heater circuit cannot operate, and the ECM will set the P0167 code.
Will replacing the oxygen sensor always fix P0167?
Not always. Wiring damage, blown fuses, poor electrical connections, or heater circuit faults should also be inspected before replacing the sensor.
How long does it take to replace Bank 2 Sensor 3?
Most oxygen sensor replacements require 30 to 60 minutes, depending on the vehicle model and sensor location.
Preventive Maintenance Tips
To reduce the chances of the P0167 code returning:
- Replace oxygen sensors at the manufacturer's recommended intervals.
- Inspect wiring and connectors during routine maintenance.
- Repair exhaust leaks immediately.
- Keep the battery and charging system in good condition.
- Use OEM-quality or equivalent replacement oxygen sensors.
- Protect sensor wiring from excessive engine heat and road debris.
Conclusion
The P0167 – Heated Oxygen Sensor (HO2S) Heater Circuit (Bank 2 Sensor 3) trouble code indicates that the heater circuit of the downstream oxygen sensor is not functioning correctly. Common causes include a faulty oxygen sensor, damaged wiring, a blown fuse, or an open heater circuit. Diagnosing and repairing the issue promptly helps reduce emissions, maintain proper oxygen sensor operation, and ensure the vehicle's emissions control system performs efficiently.
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