Engine fault code 2C9C for O2 sensor

Discussion in 'E90, E91, E92, E93' started by yapmy, Apr 30, 2019.

  1. yapmy

    yapmy New Member

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    Hi guys. My car's engine threw a fault code 2C9C when I did a scan. Something to do with the O2 sensor Bank 1. Does changing the sensor solve the issue? Is it normally the O2 Bank 1 pre cat sensor that needs to be replaced?

    No engine check light is on but fuel consumption on the high side about 15.3L per 100KM.

    Thanks guys
     
  2. yapmy

    yapmy New Member

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    Solved by changing O2 Bank 1 Before Cat sensor.
     
    gendong likes this.
  3. bobbychoo

    bobbychoo New Member

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    Any improvement on the fuel consumption after that?
     
  4. yapmy

    yapmy New Member

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    Yes. Consumption reduced about 1.5 to 2L/100KM from changing the O2 sensor.
     

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