2009 Saturn Vue OBD2 Code P0031 HO2S Heater Control Circuit Low

What Does P0031 Code Mean?

OBD-II Code P0031 is defined as a HO2S Heater Control Circuit Low

The purpose of the oxygen sensor is to measure the oxygen content in the exhaust gases after they leave the combustion process of the engine. The oxygen sensor must be at a certain temperature in order for this information to be accurate. The oxygen sensor has a heater wire inside to help bring the sensor up to temperature quicker. When the PCM detects the heater wire is not operating, it will set code P0031.

P0031 Symptoms

• Decreased engine performance
• Increased fuel consumption

Common Problems That Trigger the P0031 Code

• Oxygen sensor failure
• Powertrain Control Module (PCM) failure
• Wiring issue

Common Repairs Needed for the P0031 Code

• Oxygen Sensor Replacement