Not sure if anyone can help me with this. I have a 2002 Sentra SE-R and my check engine soon light came on. So I went to autozone and did the free diagnostic test. They said the issue # was P0031 and "Heater control circuit low". Has anyone come across the same problem and if so, what does it mean? Thanks for your help.
"Heater Control Circuit Low" P0031
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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
This is due to either a bad connection or a defective O2 sensor.
Lew
Perfect! Thanks for your help. So the 02 sensor basically monitors the air going to the engine...
Actually, I take that back. Does is monitor the exhaust?
The O2 sensor is in the exhaust, and measures unconsumed oxygen. This is related to the air-fuel ratio going into the cylinders.pscd27 said:Perfect! Thanks for your help. So the 02 sensor basically monitors the air going to the engine...
The Mass Airflow Meter (MAF) measures the air going into the engine.
Lew
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