P1031 - FAULT CODE - OBD2

POST UPDATED IN February, 2023

P1031 Code failures by brands

P1031 BUICK, CADILLAC, CHEVROLET, DODGE, GMC, OLDSMOBILE, PONTIAC, SATURN: AIR FUEL RATIO SENSOR 1 HEATER CONTROL CIRCUIT LOW BANK 1

Description of DTC code P1031

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

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

Causes of OBD2 P1031

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

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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