Compatibility: 2001-2004 Buick Century 3.1L 2002-2004 Buick Rendezvous 3.4L 2001-2004 Chevrolet Impala 3.4L 2001-2004 Chevrolet Monte Carlo 3.4L 2001-2004 Chevrolet Venture 3.4L 2001-2004 Oldsmobile Silhouette 3.4L 2001-2004 Pontiac Aztek 3.4L 2001-2003 Pontiac Grand Prix 3.1L 2001-2004 Pontiac Montana 3.4L Q&A: Q:What is Differences Between upstream and downstream O2 Sensor? .
