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One of exhaust system's parts which serve an essential job in producing exhaust with the least level of toxic elements is the Lexus oxygen sensor. When talking in automotive language, oxygen sensors are also being referred to as O2 sensor, lambda probe, lambda sensor, lambda send or EGO. As a subsequent reaction to the performance quality of exhaust system with the help of the Lexus RX400H oxygen sensor, engine damage would be prevented and the engine will bring good mileage and performance quality. Efficient performing Lexus RX400H oxygen sensor must possess certain qualities.