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  1. Oxygen Sensor Wiring Reference

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    1987-1989 Speed Density Truck 3-wire HEGO (Single) HEGO SIG at EEC Pin #29 HEGO GND at Sensor body 1990-1995 Speed Density Truck 4-wire HEGO (Single) HEGO SIG at EEC Pin #29 HEGO GND at EEC Pin #49 1994-1995 5.0L Mass Air Truck 4-wire HEGO (Single) HEGO SIG at EEC Pin #44 HEGO GND at EEC Pin...
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