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Features:-Brand New Oxygen Sensor (Not Air Fuel Ratio Sensor)-Direct Plug-In Replacement-Warranty: 6 Months Warranty-Wires: 4 Wires-Interchange Part Number:234-4087 234-4650-Other Part Number:12559850 12561776 12562943 1256712725175454 25312202 25312206 8125671270Fitment:Position: Upstream+Downstream2001-2003 Oldsmobile Silhouette 3.4L2001-2004 Pontiac Aztek 3.4L2001-2003 Pontiac Grand Prix 3.1L2001-2004 Pontiac Montana 3.4LNote: Better to check the original oxygen sensors and compare with the items before purchasing, in case of ordering a wrong part or making any inconvenience.Package Included:2* Oxygen Sensors