1989 Toyota pickup: oxygen sensorng diagram - ASAP Jul 08, 20101989 Toyota pickup 22-re; the oxygen sensor plug male end was lost during the installiation of another used motor from another pick-up. I need to know the the wiring diagram for a 4 wire from the harness to where it plugs into the 0-2 sensor in front of the catalyic converter. have not been able to get help here.. [email protected] 1989 toyota pickup oxygen sensor | eBay Find great deals on eBay for 1989 toyota pickup oxygen sensor. Shop with confidence. Skip to main content. eBay Logo: Upstream O2 Oxygen Sensor For Toyota Pickup 2 4WD Calif. 1991-1989 See more like this. Oxygen Sensor For 1989-1991 Toyota Pickup 1990 Q929BC OE Connector 4 Wire (Fits: 1989 Toyota Pickup) Brand New. $41. FAST 'N FREE.