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Thread: O2 sensors in GSR

  1. #1


    Which 02 sensor is the primary? Which is seccondary? Before cat or after cat??? Which is which?

  2. #2


    pri - the one in the header's collector
    secondary - on the cat

  3. #3


    Isn't the secondary to see if the cat is doing it's job (for OBD-II). Hence why it is placed at the end of the cat.

  4. #4

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