P0031 - Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 1 Sensor 1

About Trouble Code P0031

The engine exhaust must have a specific air to fuel ration, this is signaled by the Heated Oxygen Sensors that detect the O2 content in the vehicle’s exhaust. It is essential for this to be accurate, so the engine can run correctly. If the engine’s computer finds the sensor reading abnormally it will trigger code P0031. The Heated Oxygen Sensors are heated to give rapid response time to the engine’s computer, this controls emissions during starting and when the engine is cold. A malfunction will make this error code appear.

Symptoms of Trouble Code P0031

Naturally, the check engine light will illuminate. The computer may also detect that the heater circuit for the O2 sensor is low or has entered a failsafe mode until the vehicle is turned off. This mode causes many trouble codes to appear depending on the vehicles engine computer. Other reports have shown hesitation during driving and rough rides with low power.

Causes of Trouble Code P0031

Damage or defect in the Heated Oxygen Sensor for engine bank 1 sensor 1 will cause this trouble code to appear due to inaccurate data being sent to the engine’s computer. A bad heating element or a bad ground in the sensor could also cause this to occur.

How to Fix Trouble Code P0031

Verify the code exists by clearing it and taking the vehicle for a drive to see if the code resurfaces. If it does return, there may be several fixes needed. Damaged wiring needing replaced due to excessive heat from the exhaust is probably the most common solution. Check the voltage in the feed between the battery and the heating element. If there is no voltage, you will need to repair the open or short feed circuit. Determine if you need to replace a blown fuse from a short. If the voltage is intact, remove the ground circuit from the computer and check for resistance in the circuit. If found to be infinite you will need to repair the open circuit. All of this check out will lead you to, more than likely, a bad O2 sensor in need of replacement.

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