This high-quality new oxygen sensor covers OEM numbers MD329341, MD336490, MD177969, MD327693 and MD33644, fitting various vehicle models. It accurately monitors oxygen levels in exhaust gas to adjust engine air-fuel ratio intelligently. Made of high-temperature resistant materials, it maintains sensitive response and stable signal transmission long-term. Built to standard OEM specifications, it is easy to install and an ideal replacement for old or faulty original oxygen sensors.