my check engine light is on due to insufficient air flow, is that sensor, only code Egr system
Is there a sensor for insufficient air flow? on 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