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Thread: 2011 335i E90 Number of Cats

  1. #1
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    2011 335i E90 Number of Cats

    How many cats does a factory 2011 335i E90 have? Two or one? How many oxygen sensors?

  2. #2
    Join Date
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    North Carolina
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    2009 335i M-Sport Coupe
    Since your 335i is a 2011 model year, it should have the N55 engine with the engine cover that says "twin power turbo." Since that car has one turbo, it only has one catalytic converter and 2 oxygen sensors. The downpipe (part number 18328603874) contains the catalyst and has ports for the 2 oxygen sensors.

  3. #3
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    Thanks! Is it the same for a 335xi?

  4. #4
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    2009 335i M-Sport Coupe
    The 335xi has the same setup, but the 335is (with the DCT transmission) runs the n54 engine with a total of 3 cats and 4 O2 sensors.

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