1999 f-150 O2 sensor
#1
#2
#3
Join Date: Oct 2002
Location: St. Louis (Out in the woods)
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All four O2 sensors should have four wires. Ford didn't use three-wire sensors any longer when that truck was designed and built. If your sensor only has three wires, that would mean it's either the wrong part or has been damaged.
The sensors on the left and right are interchangeable with the possible exception of wire harness length.
The sensors on the left and right are interchangeable with the possible exception of wire harness length.