2pcs Upstream & Downstream Oxygen Sensor 234-4620 234-4621 O2 Sensor 1 and Sensor 2 Replacement for 1998 1999 2000 2001 2002 Honda Accord 2.3L F23A1 & F23A5 Engine Package Includes: (one upstream + one downstream For F23A1& F23A5 only) Length 234-4621: 550 mm (21.7 inch). Wires: 4. 234-4620: 300 mm ( 11.81 inch) Wires: 4 F23A1 & F23A5 Engine only 1 upstream + 1 downstream For 1998-2002 Honda Accord 2.3L l4 Warranty: One Year Unlimited Miles This is Brand New High Quality Aftermarket Product. Meet the professional specification as OEM parts, for stable performance durable service.