P CODES (POWERTRAIN) P0100 - P0199 P0152

    Definition of Trouble Code P0152

    Trouble code P0152 refers to Oxygen Sensor Circuit High Voltage (Bank 2 Sensor 1). This code is triggered when the Engine Control Module (ECM) detects that the voltage from the oxygen sensor on bank 2, sensor 1, is too high. High voltage readings indicate that the sensor is sending a signal to the ECM, showing a rich air-fuel mixture in the exhaust stream.

    Diagnosing Trouble Code P0152

    Follow these steps to diagnose the root cause of trouble code P0152:

    1. Verify the code: Using an OBD-II scanner, check for the presence of trouble code P0152. If it is present, record any additional codes, as well as freeze frame data. Clear the codes and then take the vehicle for a test drive to see if the code reappears.

    2. Inspect the oxygen sensor: Visually inspect the oxygen sensor (bank 2, sensor 1) for any signs of damage or contamination. Pay attention to the sensor's wiring and connector. If the sensor appears damaged, replace it.

    3. Check for exhaust leaks: Inspect the exhaust system, particularly around the area of the oxygen sensor, for any signs of leaks. If an exhaust leak is found, repair it before proceeding.

    4. Test the oxygen sensor: Using a digital multimeter, measure the voltage output from the oxygen sensor while the engine is running. A properly functioning sensor should produce a fluctuating voltage between 0.1 and 0.9 volts. If the voltage remains consistently high, replace the sensor.

    5. Inspect the wiring and connections: Check the wiring and connectors related to the oxygen sensor and the ECM. Repair any damaged or corroded wiring and replace any damaged connectors.

    6. Check the fuel system: If the previous steps have not resolved the issue, there may be a problem with the fuel system causing a rich air-fuel mixture. Inspect the fuel injectors, fuel pressure regulator, and the Mass Air Flow (MAF) sensor for proper operation. Replace or repair any faulty components as needed.

    Repairing Trouble Code P0152

    Based on the diagnosis, follow these steps to repair trouble code P0152:

    1. Replace the oxygen sensor: If the oxygen sensor (bank 2, sensor 1) is found to be faulty, replace it with a new one. Ensure the wiring and connector are secure and free of damage.

    2. Repair exhaust leaks: If any exhaust leaks are found, repair them to ensure accurate readings from the oxygen sensor.

    3. Repair wiring and connections: If any damaged or corroded wiring or connectors are found, repair or replace them to ensure proper signal transmission between the oxygen sensor and the ECM.

    4. Replace or repair fuel system components: If any fuel system components are found to be faulty, replace or repair them as needed to restore proper air-fuel mixture.


    Once the necessary repairs have been made, use the OBD-II scanner to clear the trouble code P0152. Take the vehicle for a test drive to ensure the issue has been resolved. If the code reappears, further diagnosis may be required to identify any underlying issues. By following these steps, you can diagnose and repair trouble code P0152, ensuring your vehicle's oxygen sensor operates efficiently and your engine runs smoothly.

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