Description: Brand new direct replacement for the plug-in. Wire: (1 wire and 4 wires, not 2 wires) Location: Upstream and Downstream Fits: 1999 Isuzu Hombre S – 2.2L 1999 Isuzu Hombre XS – 2.2L 1999 Chevrolet S10 Base – 2.2L Gas Engine 1999 Chevrolet S10 LS – 2.2L Gas Engine 1999 Chevrolet S10 Xtreme – 2.2L Gas Engine 1999 GMC Sonoma SL – 2.2L 1999 GMC Sonoma SLE – 2.2L 1999 GMC Sonoma SLS – 2.2L 2000 Isuzu Hombre S – 2.2L 2000 Isuzu Hombre XS – 2.2L 2000 Chevrolet S10 Base – 2.2L Gas Engine 2000 Chevrolet S10 LS – 2.2L Gas Engine 2000 Chevrolet S10 Xtreme – 2.2L Gas Engine 2000 GMC Sonoma SL – 2.2L Gas Engine 2000 GMC Sonoma SLE – 2.2L Gas Engine 2000 GMC Sonoma SLS – 2.2L Gas Engine Includes: 2 Oxygen Sensors 138277×1—Upstream 127352×1—Downstream