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Discussion Starter · #1 ·
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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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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