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This set of upstream and downstream O2 oxygen sensors is a high-quality replacement for the Volkswagen Passat, designed to meet OEM specifications. They monitor the oxygen levels in the exhaust system, providing accurate data to the engine control module for precise fuel management. This improves fuel efficiency, reduces emissions, and ensures smooth engine operation. Made from durable materials, the sensors resist heat, corrosion, and wear for long-lasting performance. Easy to install, they are ideal for replacing worn or faulty sensors to maintain optimal vehicle performance.