马自达福美来二代宝马机头后氧传感器HB00-18-861M1，直接换装省心

This rear oxygen sensor is dedicated to Mazda Premacy second generation with BMW engine (2006-2009, 1.6L/2.0L). Ensures perfect compatibility with original exhaust system. Core function is real-time monitoring of exhaust oxygen content and feeding ECU to adjust air-fuel ratio, improving efficiency, reducing emissions, and optimizing fuel economy. OEM number HB00-18-861M1 ( Mazda original part HB00-18). Replacement difficulty is low; simply unplug and plug in, no extra programming needed. For B2B buyers, this sensor uses a high-precision ceramic core with strong heat shock resistance; suitable for bulk stocking or repair shops; compatible with most diagnostic tools.