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engine light on/ had a diagnostic test done results were. air flow/restriction on 2007 Chrysler Aspen

detected-slow accumulation, the calculated map value is greater than the expected map value. what could cause this problem

Asked by for the 2007 Chrysler Aspen
either congested cats. or you need to change air filter or upgrade to high air flow filter. there are fuel additives that will help clean the cats.