P CODES (POWERTRAIN) P0100 - P0199 P0147

    Definition of Trouble Code P0147

    The P0147 trouble code is related to the oxygen sensor heater circuit malfunction for Bank 1 Sensor 3. This code occurs when the engine control module (ECM) detects an issue with the oxygen sensor's heater circuit, which is responsible for heating up the sensor and ensuring accurate readings of the exhaust gases. Bank 1 refers to the side of the engine with the first cylinder, and Sensor 3 is the post-catalytic converter sensor.

    Diagnosing Trouble Code P0147

    Follow these steps to diagnose the P0147 trouble code:

    Step 1: Check for any other related trouble codes. If other codes are present, address them first before focusing on the P0147 code.

    Step 2: Perform a visual inspection of the wiring and connectors associated with the oxygen sensor. Look for damaged, frayed, or burnt wires and ensure the connections are secure.

    Step 3: Use an OBD-II scanner to retrieve freeze frame data and observe the live data related to the oxygen sensor. This can provide useful information about the sensor's performance and any irregularities.

    Step 4: Use a digital multimeter to test the oxygen sensor heater circuit's resistance and voltage. Compare the values to the manufacturer's specifications. If the values are out of range, the heater circuit may be faulty.

    Repairing Trouble Code P0147

    Based on the diagnosis, follow these repair steps:

    Step 1: If the wiring or connectors are damaged, repair or replace them as needed. This may involve soldering wires, using heat shrink tubing, or replacing connectors.

    Step 2: If the oxygen sensor itself is faulty, replace it with a new one. Make sure to use a high-quality, compatible sensor to ensure proper function and compatibility with the vehicle's ECM.

    Step 3: In some cases, the ECM may be causing the issue. If all other components have been checked and found to be in good condition, have the ECM tested by a professional technician. If the ECM is faulty, it will need to be replaced or reprogrammed.

    Step 4: After making the necessary repairs, clear the trouble codes using an OBD-II scanner and perform a test drive to ensure the issue has been resolved.


    The P0147 trouble code relates to the oxygen sensor heater circuit malfunction in Bank 1 Sensor 3. Properly diagnosing and repairing this issue is crucial to ensure optimal engine performance, fuel efficiency, and emissions compliance. By following the steps provided for diagnosing and repairing the problem, you can effectively resolve the P0147 trouble code and restore your vehicle's performance.

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