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DTC P0119 and P0138?

Tiny
OREO101
  • MEMBER
  • 2005 FORD EXPEDITION
  • 5.4L
  • V8
  • 4WD
  • MANUAL
  • 200,000 MILES
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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Tuesday, July 19th, 2022 AT 4:44 PM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
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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Wednesday, July 20th, 2022 AT 1:47 PM
Tiny
OREO101
  • MEMBER
  • 81 POSTS
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?
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Thursday, July 21st, 2022 AT 7:34 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
The O2 sensor (Bank 1 Sensor 2) is on the passenger's side, post cat. Let me know.
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Thursday, July 21st, 2022 AT 10:43 AM
Tiny
OREO101
  • MEMBER
  • 81 POSTS
I'm still working on it.
Bummer, I need to remove intake manifold to get to Coolant Temperature Sensor.
Is that correct? :(
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Thursday, July 28th, 2022 AT 3:10 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
Yes, that is correct. Sorry about that.
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Friday, July 29th, 2022 AT 9:33 AM
Tiny
OREO101
  • MEMBER
  • 81 POSTS
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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Wednesday, August 3rd, 2022 AT 6:22 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
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?
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Thursday, August 4th, 2022 AT 6:41 PM
Tiny
OREO101
  • MEMBER
  • 81 POSTS
Okay! This has a connector I will upload soon. This is Engine Coolant Temperature Sensor.
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Sunday, August 7th, 2022 AT 8:08 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
Good call, thanks for the image, let me know what happens I am interested.
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Monday, August 8th, 2022 AT 5:37 PM

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