Hello, Welcome to 2CarPros. That looks a lot like the harness that goes to one of the O2 sensors. Three wires are common between the four sensors.
Black which is the heater ground, A dark blue with light green stripe which is the sensor ground to the ECM,
Then the Orange wire with green stripe which is the power feed to the heater circuit in the sensors and a couple other items.
See the attached to determine which sensor that harness should go to is. The fourth wire will tell you which sensor it is. Just be careful as both of the downstream sensors use a tan with white stripe signal wire, but one changes to pink with a white stripe after the connector.
Image (Click to make bigger)
SPONSORED LINKS
Wednesday, April 17th, 2019 AT 3:45 PM