2 PCS Oxygen O2 Sensors 1 Upstream and 1 Downstream Compatible with BMW 323Ci 323i 325Ci 325i 328Ci 328i 330Ci 330i 525i 528i 530i M3 X3Z3 Z4 2001-2006 325xi 330xi X5

2 PCS Oxygen O2 Sensors 1 Upstream and 1 Downstream Compatible with BMW 323Ci 323i 325Ci 325i 328Ci 328i 330Ci 330i 525i 528i 530i M3 X3Z3 Z4 2001-2006 325xi 330xi X5

• Interchange Part number: 13477 234-4672 for upstream position, 15109 234-4683 for downstram position.
• One Year Unlimited Warranty. Features double protection layer, aluminum oxide trap layer, PTFE filter and stainless steel housing.
• Lambda sensor can improve engine efficiency performance and fuel economy, reduce CO2 and other harmful emissions, extend expensive Catalytic Converter life.
• The metal shroud doesnot look as shiny as other Oxygen Sensors. Because it is made of SUS310 high temperature resistant material. And every single item is heated at 1562℉. The high temperature also makes it stands wear and tear.
• Please use the Year & Make & Model drop down bar and check the wire length & plug & position to confirm the compatibility before placing orders. Please check your part pictures with our pictures, it must be completely same. Or it will not fit your car. It will save your time and cost. If you have any questions or the items you received with problems, contact us directly, we'll provide you with some professional suggestions within 24 hours.