One of my airbox clip is broken, could it be the reason the light comes on because of an intake air leak?
P0420 Catalyst below efficiency Bank 1
Any air that gets past the MAF (Mass airflow ) is considered a vacuum leak, What a vacuum leak is is unaccounted for air that is measured by either a MAF sensor or a MAP (manifold absolute pressure) sensor.
Here is a MAF sensor and the MAF air duct, if air got pass the MAF this would be considered a vacuum leak. So no a clip missing on a airbox is not considered a intake leak
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