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  1. cruiserdan

    Cats are off, will gutting them throw the check engine light? What are my options?

    Yes. The front sensor is pre-cats. The rear sensor is behind the second cat.
  2. cruiserdan

    Cats are off, will gutting them throw the check engine light? What are my options?

    The downstream O2 will sense a catalytic inefficiency if both cats are not present and functioning.
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