This premium oxygen sensor corresponds to part numbers 2344491, BA5Z9G444A and BA5Z-9G444-A.It offers upgraded working performance and solid durability for regular automotive application. It precisely tracks oxygen levels in exhaust gas and sends real-time signals to the vehicle ECU. This helps refine fuel combustion efficiency and cut down harmful exhaust emissions effectively. Adopted with high-grade anti-corrosion raw materials, it keeps sensitive response and steady running state. It complies fully with OEM specification criteria, making it a perfect substitute for aftermarket replacement.