I can't locate the downstream sensor harness wire under truck.
Dec 9, 2023 at 2:22 PM
Where is the oxygen sensor/oxygen sensor harness located?
2004 FORD F-250
LEVELTWO
- MEMBER
- 6 POSTS
Advertisement
JACOBANDNICKOLAS
- ✓ASE Certified Mechanic
- 110,194 POSTS
Hi,
Was it connected before working on the vehicle? Also, on some sensors, the wiring is connected to it from the factory and the connector is in the engine compartment.
Let me know.
Joe
Was it connected before working on the vehicle? Also, on some sensors, the wiring is connected to it from the factory and the connector is in the engine compartment.
Let me know.
Joe
Dec 9, 2023 at 11:00 PM
It seems as if there was no downstream oxygen sensor, or downstream harness wire.
Dec 11, 2023 at 12:43 PM
JACOBANDNICKOLAS
- ✓ASE Certified Mechanic
- 110,194 POSTS
Hi,
Check behind the engine to see if anything is disconnected. I'm not sure what someone has done. The wiring from the sensor goes in different directions, so there has to be a connector at some point.
I attached a pic below at least showing the wire colors you should be looking for at a connector. It should be a round connector with 4 pins.
Let me know.
Joe
See pic below.
Check behind the engine to see if anything is disconnected. I'm not sure what someone has done. The wiring from the sensor goes in different directions, so there has to be a connector at some point.
I attached a pic below at least showing the wire colors you should be looking for at a connector. It should be a round connector with 4 pins.
Let me know.
Joe
See pic below.
Image (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Click here to log in and view diagram.
Dec 11, 2023 at 8:32 PM
Thank you, if I`m getting it right, if I don`t have a California truck, I won't have a down flow oxygen sensor.
Dec 13, 2023 at 2:57 PM
JACOBANDNICKOLAS
- ✓ASE Certified Mechanic
- 110,194 POSTS
Hi,
According to the wiring schematic, that appears to be correct. Is there a place for one in the exhaust or any indication one was present?
Joe
According to the wiring schematic, that appears to be correct. Is there a place for one in the exhaust or any indication one was present?
Joe
Dec 13, 2023 at 7:08 PM
Originals exhaust, no place present for downhill oxygen sensor, no wiring harness visible.
Dec 14, 2023 at 12:45 AM
Exhaust systems look as if it's original there's no place for the downstream oxygen sensor nor is there a harness for the downstream present.
Dec 14, 2023 at 12:55 PM
(Merged)
STRAILER
- ✓ASE Certified Mechanic
- 54,832 POSTS
There is only the downstream oxygen sensor on California trucks. Let us know if you need anything else.
Dec 14, 2023 at 12:55 PM
(Merged)
Thanks.
Dec 14, 2023 at 12:55 PM
(Merged)
STRAILER
- ✓ASE Certified Mechanic
- 54,832 POSTS
You are welcome, please use 2CarPros anytime we are here to help.
Dec 14, 2023 at 12:55 PM
(Merged)
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.