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This O2 sensor set, designed for the front and rear positions of the Toyota Avalon, provides precise monitoring of exhaust gases to maintain the proper air-fuel ratio. By sending accurate data to the engine control unit, these sensors help optimize fuel economy, reduce harmful emissions, and ensure smooth engine performance. Built to meet OEM specifications, they are durable, reliable, and easy to install, making them the perfect replacement for worn or faulty sensors. Replacing both front and rear O2 sensors restores efficiency and helps keep your Avalon compliant with emission standards.