Seller notes

For Buick GMC Savana Chevy Express Pontiac Upstream Downstream O2 Oxygen SensorInterchange Part Number "234-4087,ASG277,4A234-4087,A13444,AES20002,A-AFS123,A-AFS98,A-AFS97,AA12578459,AA12587214,AA19178921,AA19178924"Please check fitment notes & description for accurate information. YearModelMakeEnginePosition2008-2009BuickAllureV8 5.3LUpstream (Front);Downstream (Rear)1996-1996BuickCenturyL4 2.2LDownstream (Rear) 1996-2004BuickCenturyV6 3.1LDownstream (Rear) 2008-2009BuickLacrosseV8 5.3LUpstream...

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