The Chevrolet/GMC O.E.M reman cardone 74-10281 mass air flow sensor fits 09-11 chevy pontiac (b423 is a sensor/switch from Chevrolet/GMC. It detects the presence, position, or proximity of a target object, or switches a circuit, outputting a signal to trigger or monitor a machine process. It is commonly in packaging machinery, material handling, and automated inspection systems.
