P0138 2009 Ford Fusion Code - O2 Sensor Circuit High Voltage Bank 1 Sensor 2

The code P0138 indicates a high voltage condition in the O2 sensor circuit of Bank 1 Sensor 2 in the exhaust system of the vehicle.

Common symptoms of a P0138 code may include poor fuel economy, rough idling, engine misfires, and the illumination of the check engine light on the dashboard.

Possible causes of a P0138 code include a faulty O2 sensor, damaged wiring or connectors in the O2 sensor circuit, exhaust leaks, or issues with the engine's fuel system.

While a P0138 code may not cause immediate harm to the vehicle, it can lead to decreased fuel efficiency and performance if left unaddressed. It is recommended to diagnose and repair the issue promptly.

Diagnosing a P0138 code involves using an OBDII scanner to retrieve the code, inspecting the O2 sensor and its wiring for damage, checking for exhaust leaks, and testing the sensor's voltage output.

It is generally safe to drive the vehicle with a P0138 code, but it is advisable to address the issue as soon as possible to prevent potential damage to the engine and to maintain optimal performance.

Repairing a P0138 code may involve replacing the Bank 1 Sensor 2 O2 sensor, repairing damaged wiring or connectors, fixing exhaust leaks, and clearing the code using an OBDII scanner.

Resetting the check engine light may temporarily clear the code, but it will not fix the underlying issue causing the P0138 code. It is important to diagnose and repair the problem to prevent the code from reappearing.

A P0138 code can potentially cause your vehicle to fail an emissions test due to the high voltage condition in the O2 sensor circuit. It is recommended to address the issue before undergoing an emissions test.

The cost of repairing a P0138 code can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor, including the replacement of the O2 sensor if necessary.