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    Description of DTC code P1031 Generic

    Correct fuel injection is based on the readings of conventional oxygen sensors. On the other hand, modern vehicle models add some A/F Sensors (Air/Fuel Ratio Sensors), which guarantee better accuracy in their readings. Although the oxygen sensor and an A/F sensor are similar, the latter has more wires.

    They are also known as lambda sensors. A/F sensors are installed in the front exhaust pipe or manifold. They measure how much oxygen is in the exhaust over a wider range, and send that information to the ECM (Engine Control Module). This module takes this data into account and adjusts the air/fuel ratio to keep it within the most optimal level.

    The P1031 OBDII diagnostic code setting P1031 means that after completing the On/Off service check of the bank 2 A/F Sensor 1 heater, the ECM detects the voltage of that circuit is excessively below the allowed level.

    Symptoms of fault code P1031 Generic

    • Check Engine light ON.
    • Unstable operation during idling.
    • Lower fuel efficiency.

    Causes of OBD2 P1031 Generic

    The reasons for storing the P1031 OBD2 fault code P1031 are:

    • Common damage to the A/F Sensor 1 heater circuit wires or connectors.
    • Faulty electrical connections at the air/fuel ratio sensor.
    • The A/F sensor may be damaged.

    Possible solutions of the DTC code P1031 Generic

    To troubleshoot DTC P1031 OBDII, try this:

    • Consult the TSBs (Technical Service Bulletins).
    • Check the Air/Fuel Ratio Sensor 1 for shortages in any of its wires or connectors. Repair as required.
    • Perform voltage tests on the A/F Sensor. Take into account the manufacturer's diagnostic steps. If these checks reveal an out-of-range voltage, make the appropriate adjustments.
    • Verify that the resistance of the Air Fuel Ratio Sensor 1 matches the level allowed for proper operation. An out-of-range resistance requires the replacement of the sensor.


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