马自达/奇瑞/海马/中华氧传感器 HC00-18-861AM1，通用替换件

For multiple brands including Mazda, Chery, Haima, Zhonghua, etc., 1.6L–2.0L engines can use HC00-18 oxygen sensor as a universal replacement. Sensor uses high-temperature ceramic core and stainless steel housing; material and process close to original; life expectancy exceeds 80% of original; suitable for budget repair shops. Function: monitor exhaust oxygen and feed back to ECU to adjust air–fuel ratio, effectively reducing fuel consumption and emissions. Replacement requires a special socket wrench; avoid damaging threads; operate with the engine cold.