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Catalytic Converters
Check Engine Light

What type of cap can you put on the wiring on a Cadillac converter to keep the check engine light off after you take off the Cadillac converter to improve gas mileage?

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Wiki User
May 13, 2012 2:47PM

Removing the catalytic converter is illegal. It will also not improve fuel mileage. The engine will not run properly with the converter removed and the check engine light will not go off and cannot be turned off as it will just come back on. The ECU will try to adjust the fuel/air mixture to compensate for the missing converter which will hurt economy not help it. The fine is $2,500 if you are caught. Install a converter back on your car ASAP.