For Mazda 3 BK 1.4 2003-2009 Lambda Sensing Unit Upstream Downstream Oxygen Sensor Z601-18-861

Compatibility：For 3 BK Hatchback 1.4 2003 2004 2005 2006 2007 2008 2009 Installation: Before installing this oxygen sensor, assure the vehicle’s engine is switched off and the exhaust pipe has cooled to room temperature to avoid burns caused by high temperatures; it is also advisable to disconnect the negative terminal of the battery for added reliability. Function: By optimising the combustion process, the oxygen sensor reduces the formation of particulate matter in the exhaust, helping to keep the exhaust system clean and lowering the risk of blockages and faults. 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.