What does the Oxygen Sensor 1/1 do in my car?

6 Answers

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  • John
    Lv 7
    8 months ago

    Keeps the auto light on the display turned off so you can pass smog.

  • 8 months ago

    It senses the O2 content in the exhaust so the computer can adjust the fuel mix for optimum economy and emissions.

  • 8 months ago

    It's part of the system controlling the gas mixture to the cylinders and needs to be replaced if bad.

    Source(s): Mitsubishi Master Tech
  • Jay P
    Lv 7
    8 months ago

    Regardless of where an oxygen sensor sits, it does the same thing...sniffs the exhaust to see how much oxygen remains in the exhaust flow.  This is done to check if the engine fuel:air mixture is too rich or too lean.

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  • Anonymous
    8 months ago

    It is the oxygen sensor on bank 1 exhaust before the catalytic converter.  A bank is simply a row of cylinders.  If the car has a 4 cylinder engine, there is only one bank. 

    The oxygen sensor detects the amount of oxygen in the exhaust.  It is essentially a small voltmeter and the sensor sends a voltage signal to the car's computer when the engine is running.  When there is too much oxygen in the exhaust, the car is said to be running lean.  If there is less oxygen, the car is said to be running rich.  The car's computer needs to know this so it can adjust the fuel feed to the engine so the car can run right.

    When the computer is adding or reducing fuel more than programmed values for a certain time, the computer will throw a Check Engine Light to tell the driver that there is something wrong with the car.  That is when you see the $80 an hour dude, aka the mechanic.

  • L.N.
    Lv 7
    8 months ago

    It adjusts the amount of fuel being injected into bank 1. Bank 1 sensor 2 makes sure the catalytic converter is working. 2/1 and 2/2 do the same on bank 2.

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