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【Fitment】The knock sensor is fit for Mazda 3 BK 1.4/1.6/2.0/2.3/03-09,please check the product make sure it fits for your car. 【OE Part Number】According to the original factory specifications, the sensor perfectly matches your original car,replaceable OE number, for reference:ZJ01-18-921. 【Features】The car knock sensor is processed by professional manufacturing, it has high accuracy and durable. 【High Quality】The auto knock sensor uses high-quality hose material, which is lighter and more durable. 【Easy to Install】The knock sensor is easy to install,it is perfect match to your original car.