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  1. Racefiend

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

    The vast majority of OBD2 cars I've worked on put sensor two between the first and second cat. Is the OBD2 LC behind both cats?
  2. Racefiend

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

    You will throw a code without the front cat in place. The fact you didn't have the light on before says they should still be working. Take a look at the honeycomb and make sure it looks good. If it's melted they're on their way out. If not, slap them back in. You don't want to buy new ones right...
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