Is there a sensor for insufficient air flow? on 1997 Chevrolet Lumina

my check engine light is on due to insufficient air flow, is that sensor, only code Egr system

Asked by for the 1997 Chevrolet Lumina
My guess you are saying its a P0401 EGR flow code. If it is its nmot likely a bad sensor. Most likely the EGR passages in the intake manifold are stopped up with carbon.
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This code comes on when carbon builds to the point of being a solid crystal, it's needs to be drilled completely out clear all passages to allow air flow again. Preventative in future would recd. fuel system services every 20-30k