P CODES (POWERTRAIN) P0100 - P0199 P0163

    Comprehensive Guide to Diagnosing and Repairing Trouble Code P0163 - Oxygen Sensor Circuit Low Voltage (Bank 2 Sensor 3)

    Definition of Trouble Code P0163

    Trouble code P0163 refers to a malfunction detected in the Oxygen Sensor Circuit, specifically when the voltage output from Bank 2 Sensor 3 (B2S3) is lower than expected. The oxygen sensor (O2 sensor) is an essential component of the vehicle's emission control system, responsible for monitoring the level of oxygen in the exhaust gases to help the engine control module (ECM) optimize fuel mixture and combustion efficiency.

    Diagnosing Trouble Code P0163

    To diagnose the cause of trouble code P0163, follow these steps:

    Step 1: Read the code

    Using an OBD-II scanner, connect to the vehicle's diagnostic port and read the trouble code. Record any additional codes that may be related to P0163, as this can aid in diagnosing the problem.

    Step 2: Visual inspection

    Visually inspect the wiring and connections of the oxygen sensor in question (Bank 2 Sensor 3). Look for damaged, corroded, or loose connections, which may lead to low voltage readings. Repair or replace any damaged components as needed.

    Step 3: Check the Oxygen Sensor

    Using a digital multimeter, check the voltage output from the oxygen sensor. It should produce a voltage between 0.1 and 0.9 volts when the engine is running at operating temperature. If the voltage is outside this range, the sensor may be faulty and needs replacement.

    Step 4: Test the Oxygen Sensor Heater Circuit

    Most O2 sensors have an integrated heater circuit to help them reach operating temperature quickly. Test the heater circuit for proper resistance using a digital multimeter. If the resistance is outside the manufacturer's specifications, replace the sensor.

    Repairing Trouble Code P0163

    To repair trouble code P0163, follow these steps:

    Step 1: Replace the Oxygen Sensor

    If the oxygen sensor (Bank 2 Sensor 3) is found to be faulty, disconnect the wiring and remove the sensor using an oxygen sensor socket. Install the new sensor, making sure to use the correct torque specifications. Reconnect the wiring and secure it to avoid damage.

    Step 2: Repair or Replace Damaged Wiring or Connectors

    If the wiring or connectors are found to be damaged, corroded, or loose, repair or replace them as needed. Ensure all connections are secure and free of debris or corrosion.

    Step 3: Clear the Code and Perform a Test Drive

    After repairing or replacing the faulty components, use the OBD-II scanner to clear the trouble code P0163. Perform a test drive to ensure the Check Engine Light does not return, indicating a successful repair.


    Trouble code P0163 - Oxygen Sensor Circuit Low Voltage (Bank 2 Sensor 3) is typically caused by a faulty oxygen sensor or issues with the wiring and connections. Diagnosing and repairing the problem involves checking the sensor, its heater circuit, and the associated wiring. After fixing the issue, clear the code and perform a test drive to confirm the repair was successful.

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