234-4666 Oxygen Sensor Upstream O2 Sensor 1 for 1997-2000 Audi A4 Quattro L4-1.8L AEB Engine, 1997-1999 Volkswagen VW Jetta L4-2.0L Engine: ABA Length (Sensor to Lead): 1350 mm ( 53.15inch). Wires: 4 Post-Cat Oxygen O2 Sensor 2 For 98-01 Volkswagen VW EuroVan 3.8L Downstream AES Engine Rear Oxygen O2 Sensor 2 Fit 1997-1999 Volkswagen VW Jetta L4-2.0L Engine: ABA Pre-Cat Oxygen O2 Sensor 1 For 2000-1997 Audi A4 Quattro L4-1.8L AEB Engine Upper Warranty: One year unlimited miles.