The Purpose of an Oxygen Sensor

courtesy of Bob, The Auto Answer Man

Hi Bob,
My mechanic says that I need to replace the oxygen sensors in my 1997 BMW. He really couldn't explain their function in English, so I was hoping that you could shed some light. Thanks for the help

The oxygen sensor senses how the engine is running based on the composition of the exhaust gas. If there is too much oxygen in the exhaust, then the engine is running too lean (add more fuel). If there is not enough oxygen in the exhaust, then the engine is running too rich (too much fuel). This sensor basically tells the on board computer what is happening so it can make the appropriate adjustments to the fuel mixture.
Good Luck!
Drive Safely!
Bob, The Auto Answer Man

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