General description Oxygen Sensor Front+Rear 234-4669 234-4651 is designed for Chevrolet Express and GMC Savana vehicles. This product includes a 2-piece oxygen sensor that has been built and tested to strict quality control standards, ensuring reliable performance. Technical specifications Interchange Part Number: 3A234-4407, 8A234-4087 O2 Oxygen Sensor Superseded Part Number: 7A234-4651, A234-4285 Material: ABS + metal Measurement allowed error: +/- 1-3 cm Compatibility and accessories Fits Vehicles: 2004-2006 for Express 1500 4.3L 2004-2007 for Express 1500 5.3L 2004-2005 for Express 2500 4.3L 2004-2007 for Express 2500 4.8L 2004-2005 for Express 2500 5.3L 2004-2007 for Express 2500 6.0L 2005-2007 for Express 3500 4.8L 2004-2007 for Express 3500 6.0L 2004-2006 for 1500 4.3L 2004-2007 for 1500 5.3L 2004-2005 for 2500 4.3L 2004-2007 for 2500 4.8L 2004-2005 for 2500 5.3L 2004-2007 for 2500 6.0L 2004-2007 for 3500 4.8L 2004-2007 for 3500 6.0L Installation Easy installation process,