What is the P0031 fault code What is the description for the HO2S Control Circuit Low (Bank1 Sensor 1) malfunction? How do you fix the P0031 fault code What are the causes and symptoms of the P0031 error code?
What is the P0031 Fault code? What does it stand for?
If the powertrain controller module (PCM), detects that the current and desired states of the oxygen heater control circuit do differ, a P0031 code is stored.
This fault code refers to the oxygen sensor, also known as the upstream sensor. It is located in front the catalytic converter in the row of 1st cylinder. This sensor measures the oxygen content of the exhaust gas and compares it to the outside air. These data are sent to the PCM to adjust the air/fuel ratio.
For accurate readings of oxygen sensors, they must be operated at a temperature that is within the specified range. The PCM controls the heater part of the sensor and adjusts the temperature as necessary. The fault code P0031 is set by the PCM if it detects an abnormally low voltage or a defective heater component.
Depending on how severe the fault is, additional fault codes could be stored in the memory. This code is similar P0032 to P0051 and even P0052. There are many vehicles like Toyota, Hyundai, Mazda, Toyota (especially Camry), Nissan and Ford, Infiniti, Lexus and Subaru.
What is the P0031 Fault Code?
P0031 is a generic cod that can have multiple triggers. Here are some of the most commonly used ones:
- – Defective oxygen sensor (Bank 1 Sensor 1)
- – Problems with oxygen sensor heater circuits (damaged wiring and loose connections).
- – Burn the fuse for the heating element
- – The PCM is not functioning properly or the software needs to be updated (rarely).
What are the symptoms for P0031 Trouble Code
These symptoms may occur if your vehicle has a P0031 code.
- – Illumination at the check engine lights
- – A decrease in engine performance
- – An increase in fuel consumption
- – The PCM switches on failsafe mode in order to prevent further damage to your vehicle. (This mode may cause various driving complaints depending upon the programming of the PCM by the vehicle manufacturer.
How do I fix the P0031 fault code?
- – To find out if it will be back, the code must first be cleared.
- The most common cause is damage to the cables from excessive heat. It is important to inspect the cables as well as the voltage signal to sensors. Cables should be replaced if damaged. Loose connections should be repaired. They should be replaced if the connectors are showing signs of corrosion.
- Test the heater part of the sensor. The 12V battery supply should be checked. If the voltage is not present, the fuse on the heater component must be checked and replaced if it has blown. The wiring must be replaced if it is damaged or open.
- If the battery supply is stable, it should be tested for resistance by disconnecting the ground cable from the PCM. Repair any circuit cracks if infinite resistance is found.
- If all seems normal, you can replace the O2 sensor.
How Serious Is the P0031 Fault Coding?
The code P0031 allows the vehicle to be driven. However, failure of the sensor could cause excessive fuel consumption, an erratic engine operation or damage to other parts. You must fix the fault immediately to avoid problems like these.
