P1031 - FAULT CODE - OBD2
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.