"Heater Control Circuit Low" P0031 - Nissan Forum
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post #1 of 5 Old Jan 12th, 2005, 04:03 PM Thread Starter
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"Heater Control Circuit Low" P0031

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.
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post #2 of 5 Old Jan 12th, 2005, 05:39 PM
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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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post #3 of 5 Old Jan 13th, 2005, 09:43 AM Thread Starter
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Perfect! Thanks for your help. So the 02 sensor basically monitors the air going to the engine...
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post #4 of 5 Old Jan 13th, 2005, 09:51 AM Thread Starter
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Actually, I take that back. Does is monitor the exhaust?
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post #5 of 5 Old Jan 13th, 2005, 09:53 AM
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Quote:
Originally Posted by pscd27
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.

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