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Q: Oxygen Sensor on 1990 Ford F-150

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Where do the wires from the oxygen sensor go to?
(3) Answers
They go to the Engine Computer

here is an article on Oxygen Sensors and what they do

http://repairpal.com/OBD-Code-P0130-and-P0136