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Our 2pcs 02 Oxygen Sensor (Upstream & Downstream) set is designed to optimize your vehicle's fuel efficiency, engine performance, and emissions control system. The set includes both upstream and downstream sensors, which monitor the exhaust gases and relay critical data to the engine control unit (ECU). This ensures the proper air-fuel mixture for efficient combustion, improved fuel economy, and reduced harmful emissions. These sensors are precision-engineered for a direct fit and easy installation in a wide range of vehicles. Replacing your old or faulty oxygen sensors with this high-quality set will not only enhance engine performance but also help you stay compliant with emissions regulations. Crafted from durable materials, these sensors offer long-lasting reliability and precision, making them an essential component for maintaining the health of your vehicle's exhaust system.