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Does anyone know if your running with a P0420 (Catalyst System Efficiency) cel from the removal of cat, will the ecu make the car run differnetly? Like the hondas, the ecu goes into a "safe-mode" and runs the car extra rich.
 

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My cat efficiency CEL has been on for at least a month now and it hasn't affected anything, so no, it doesn't go into safe mode like Honda ECUs do :)
 
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