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For Changan For Eulove For Star 7 For Bus For Jac For Heyue . Reliable Performance:Designed for use in the pre-catalyst position, this sensor offers stable signal output for precise air-fuel ratio control. Function:the oxygen sensor can accurately and sensitively measure the oxygen concentration, increase fuel economy, ensure the normal efficiently operation of the engine and improve engine response performance, help the engine run smoothly and reduce noise, and prevent premature failure of the catalytic converter. Effectively detect oxygen content inside exhaust gas Transfer real-time data to vehicle control system. Assist engine to adjust proper fuel mixing ratioAdapt to high temperature working surrounding environment.