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1997 Chevrolet Astro Van, my engine light came on with code p0306 & p0420 what should I do first?

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1997 Chevrolet Astro Van, my engine light came on with code p0306 & p0420 what should I do first?

Vehicle: 1997 Chevrolet Astro Van

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First repair the misfire code.If there is raw fuel going into the converter it can cause the P0420 code.

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