🚗 Drive Clean, Drive Smart! Designed for perfect integration with your GM vehicle. Enhances fuel economy and reduces emissions. Manufactured to meet GM OE specifications. A trusted replacement for your vehicle's original part. Built for long-lasting performance. Fuel optimization Oxygen detection GM OE quality The GM Genuine Parts AFS21 Oxygen Sensor is engineered to detect oxygen levels in exhaust gases, ensuring optimal emissions control and fuel efficiency. This GM-recommended replacement part guarantees the same quality, reliability, and durability as your vehicle's original factory component, making it a smart choice for any GM owner.