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It would send a trouble code and your check engine light would come on. However your catalytic converter could have slowly clogged-up and not give a trouble light as the computer would compensate with the fuel curve. If this is the case, you may experience a random flash of the check engine light(indicating a missfire). If you have onstar call them imediately when this happens to run a diagnostic. Mine went bad and exhibited this behavior. It was covered under warranty, because it was emissions related. Sometimes the FEDS are good.

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18y ago

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