2Pcs Upstream & Downstream O2 Oxygen Sensor For 1999-1997 Audi A4 A6 Quattro

table.tableizer-table { font-size: 12px; border: 1px solid #CCC; font-family: Arial, Helvetica, sans-serif; } .tableizer-table td { padding: 4px; margin: 3px; border: 1px solid #CCC; } .tableizer-table th { background-color: #104E8B; color: #FFF; font-weight: bold; } Make Model Engine Year Notes AUDI A4 V6-2.8 1999-1997 AHA Engine ;1 Upstream & 1 Downstream AUDI A4 QUATTRO V6-2.8 1999-1998 1 Upstream & 1 Downstream AUDI A6 V6-2.8 1999 1 Upstream & 1 Downstream AUDI A6 QUATTRO V6-2.8 1999 1 Upstream & 1 Downstream AUDI A6 QUATTRO V6-2.8 1998 From Serial #4B-W-000 1 ; 1 Upstream & 1 Downstream VOLKSWAGEN PASSAT V6-2.8 1999-1998 1 Upstream & 1 Downstream