Orion Motor Tech New Air Fuel Ratio Upstream Oxygen Sensor For Toyota Tacoma Tundra 4Runner 2.4L 2.7L 3.4L Compatible with 8946734021, 8946735011, 234-9001, 2349001, 8946735030, 8946735040,8946735050, 8946735060 Designed to detect the amount of oxygen in the exhaust system. Fast-acting heater optimizes sensor operation. Coated threads for easy installation. Plug and Play