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 designed for Mazda Premacy second generation with BMW engine (2006-2009, 1.6L/2.0L). Ensures perfect match with original exhaust system. Core function is real-time monitoring of oxygen content in exhaust, feeding ECU to adjust air-fuel ratio, improving combustion efficiency, reducing emissions and optimizing fuel consumption. OEM number HB00-18-861M1 (Mazda original part number HB00-18). For quick cross-check, stock-keeping cross-reference available. Replacement difficulty is low; plug-and-play, no extra programming or adaptation required. Operation best in cold car to avoid scalding. For B2B buyers, sensor uses high-precision ceramic core with strong heat shock resistance; compatible with most diagnostic tools to read data stream; suitable for bulk stock or repair shops.