Check the listing for details. 2PCS O2 Lambda Oxygen Sensors Upstream & Downstream For Nissan Sentra 03-06 1.8L. Condition: New. Listed at 64.00 USD. Items Description Have any questions, please contact us first and we will do our best to solve it for you. Warranty，feel free to buy without worries. Original standard, direct replacement for the old or broken one. Made with high quality material for maximum durability... Package included 1X Upstream + 1X Downstream O2 Oxygen Sensor（15% increase in performance and energy） Feature High Performance Corrosion-resistant stainless steel construction PTFE filter blocks efficiency-robbing contaminants Refined zirconia element improves sensor response Superior design maximizes engine performance and fuel efficiency while reducing fuel consumption and harmful emissions Ensures smog test compliance Ready to use, Direct Replacement.