Mazda3 BK 2.0L 05-10 Oxygen Sensor LFN8-18-861 LFN7-18-8G1 0986AG2228

This replacement uses a ceramic sensing element and nickel-based alloy housing, with material grade matching OEM, high-temperature and corrosion resistance proven; lifespan not less than OEM. OEM numbers 0986AG2228, LFN8-18-861, LFN7-18-8G1; fits Mazda3 BK 2.0L (2005-2010) and Mazda6 (2005). Function: monitor exhaust oxygen content and feed ECU to ensure precise air-fuel ratio, improve fuel economy and emissions. Installation medium difficulty; use oxygen sensor socket to remove old part; avoid thread stripping; disconnect power before replacement and clean interfaces.