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Re: Does this GMC Truck require an OBDII Cat?
Posted to Emissions Forum on 9/7/2006 1 Reply

There is a both Federal OBD and California OBDII standards and emission standards. The federal emission 49 state truck was not intended for sale in California. Since weight is over 8500 GVWR it could have been certified as a Federal(49 state) heavy duty vehicl... Login to read more.

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