DTC P0119 and P0138?

2005 FORD EXPEDITION
200,000 MILES • 5.4L • V8 • 4WD • MANUAL
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OREO101
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Hi,

Do you think I should replace,
O2 Sensor and Coolant Temperature Sensor?
Maybe check fuel injectors?

DTC
P0138 Generic
1/3 Current
02 Sensor Circuit High Voltage Bank 1 Sensor 2

P0119
Generic
Pending
Engine Coolant
Temperature Sensor 1 Circuit Intermittent

Also, are the Downstream and Upstream the same? Because I am seeing upstream and downstream listed as the same.
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Jul 19, 2022 at 4:44 PM
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STRAILER
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Yep, I would start with the sensor, which is having an issue, here is the location of the oxygen sensor and engine coolant temperature sensor. Then I would check the spark plugs and do a replacement if needed. Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

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Jul 20, 2022 at 1:47 PM
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OREO101
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Okay, I'm on it!
I am seeing the O2 sensor (Bank 1 Sensor 2) I need to replace on left (Driver's Side) downstream/post cat, correct?
Jul 21, 2022 at 7:34 AM
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STRAILER
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the O2 sensor (Bank 1 Sensor 2) is on the passenger's side, post cat. Let me know.
Jul 21, 2022 at 10:43 AM
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OREO101
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I'm still working on it.
Bummer, I need to remove intake manifold to get to Coolant Temperature Sensor.
Is that correct? :(
Jul 28, 2022 at 3:10 PM
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STRAILER
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Yes, that is correct. Sorry about that.
Jul 29, 2022 at 9:33 AM
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OREO101
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Just double checking.
It looks like this engine has 2 coolant sensors.
The 1 under the intake manifold is a
Cylinder Head Temp Sensor.
The second 1 is All Plastic Coolant Temp Sensor - which I can see on passengers side bottom of engine. I may try to replace the plastic 1 first. Check images!
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Aug 3, 2022 at 6:22 PM
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STRAILER
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Is there an electrical connector to that sensor? I have never seen a plastic sensor before, and the manual does not show it. Can you upload an image of it?
Aug 4, 2022 at 6:41 PM
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OREO101
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Okay! This has a connector I will upload soon. This is Engine Coolant Temperature Sensor.
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Aug 7, 2022 at 8:08 PM
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STRAILER
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Good call, thanks for the image, let me know what happens I am interested.
Aug 8, 2022 at 5:37 PM