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P0031 is a malfunction in the first Oxygen Sensor Heater. The ECU detected a voltage which is too low.

This is due to either a bad connection or a defective O2 sensor.

Lew
 

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pscd27 said:
Perfect! Thanks for your help. So the 02 sensor basically monitors the air going to the engine...
The O2 sensor is in the exhaust, and measures unconsumed oxygen. This is related to the air-fuel ratio going into the cylinders.

The Mass Airflow Meter (MAF) measures the air going into the engine.

Lew
 
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