Aug 30, 2024 · The P0138 diagnostic trouble code indicates that the O2 sensor circuit for bank 1 sensor 2 is registering a high voltage condition. This sensor is located downstream of the catalytic converter …

Mar 1, 2025 · The P0138 code indicates a high voltage condition in the O2 sensor circuit for bank 1 sensor 2, leading to a rich air-fuel mixture. Common causes of the P0138 code include sensor …

Feb 9, 2024 · When your check engine light comes on, it’s never a welcome sight. One of the common trouble codes I’ve encountered is P0138, and if you’re dealing with it, you need to understand what it …

P0138 indicates your downstream oxygen sensor's voltage is too high. Click here to know possible causes and how to repair them.

Dec 19, 2024 · To reset the error codes, use an OBD-II scanner. Simply connect the scanner to your vehicle, follow the instructions to clear the trouble codes, and see if the P0138 code reappears. If the …

Description of vehicle trouble code P0138 - Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)

Your vehicle Engine Control Module (ECM) stores a P0138 when it detects the O2 sensor for Bank 1, Sensor 2 fails a voltage test. The voltage must register below 1.2 volts for over 10 seconds and …

Mar 3, 2022 · Check engine light code P0138 means O2 Sensor Circuit High Voltage (Bank 1, Sensor 2). Find out how to fix it in this article!

May 23, 2025 · The P0138 DTC is a generic trouble code that says the oxygen sensor circuit (Bank 1, Sensor 2) is exhibiting higher voltage than normal. The Powertrain Control Module (PCM) detects …

Learn about P0138 symptoms, causes, and potential solutions from the diagnostic experts at RepairPal.