P0155 2012 Ford Fusion Code - O2 Heater Circuit Bank 2 Sensor 1

Code P0155 indicates an issue with the O2 sensor heater circuit for Bank 2 Sensor 1 in the exhaust system.

Common symptoms include poor fuel economy, rough idling, engine misfires, and the illumination of the Check Engine Light.

Possible causes include a faulty O2 sensor, damaged wiring or connectors in the O2 sensor circuit, a blown fuse, or a problem with the ECM.

To diagnose the problem, you can use a multimeter to test the O2 sensor heater circuit resistance, check for proper voltage supply, and inspect the wiring and connectors for any damage.

It is not recommended to drive with a P0155 code as it can lead to poor engine performance and potential damage to the catalytic converter over time.

Repair options include replacing the Bank 2 Sensor 1 O2 sensor, repairing any damaged wiring or connectors, checking and replacing fuses if needed, and resetting the fault code with a diagnostic tool.

Clearing the code without fixing the problem will only temporarily turn off the Check Engine Light. The issue will persist and may lead to more significant problems if not addressed.

The cost of fixing a P0155 code can vary depending on the root cause of the issue, but it may range from $100 to $300 for parts and labor.

Regularly servicing your vehicle, using high-quality fuel, and avoiding rough driving can help prevent issues with the O2 sensor heater circuit.

While some may be able to address simple issues like replacing the O2 sensor, diagnosing and repairing complex electrical problems may require professional help or specialized tools.