For Mazda 3 BK 1.6 2003-2009 Lambda Sensing Unit Upstream Downstream Oxygen Sensor Z601-18-861

Compatibility：For 3 BK Hatchback 1.6 2003 2004 2005 2006 2007 2008 2009 Installation: Once this oxygen sensor has been fitted, it is advisable to record the date and mileage of the replacement to facilitate future maintenance and fault diagnosis, and to keep track of the sensor’s service durability and replacement schedule. Function: By optimising the air-fuel ratio, the oxygen sensor helps to reduce engine knock, securing smoother engine function and enhancing driving comfort and reliability. Please note: Before purchasing, please check that the make, model, year and engine type of your vehicle match those listed, to avoid installation failures due to incompatible specifications. After-sales service: Should you encounter any issues whilst using the product, please let us know and we will provide a solution without delay.