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P0128 - Engine not getting up to temperature

Tiny
SLOTHY
  • MEMBER
  • 2009 FORD ESCAPE HYBRID
  • 2.5L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Replaced the thermostat, vacuum filled the system with new Motorcraft coolant, and replaced the cylinder head temperature sensor. Using an OBD Bluetooth adapter after 30 + minutes of driving the engine temperature never gets above 200 F. I thought the optimum temperature for the FEH vehicle was around 210.
Thoughts on what else it could be.
Thanks
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Monday, November 15th, 2021 AT 6:24 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

What temperature thermostat did you install? The book calls for 218 degrees for the hybrid.

https://www.2carpros.com/articles/replace-thermostat

It sounds like you have the wrong thermostat in the car. The temperature is too low.

Roy
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Monday, November 15th, 2021 AT 11:17 AM
Tiny
SLOTHY
  • MEMBER
  • 3 POSTS
I got the one in the attached photo. RT1193 Motorcraft OEM, which is what RockAuto indicates for a 2009 Escape hybrid. The one I removed is identical to the one installed.
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Monday, November 15th, 2021 AT 12:42 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
The Stant one is what Alldata calls for. That is the higher temperature one I sent from Rock Auto.

Roy
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Monday, November 15th, 2021 AT 2:55 PM
Tiny
SLOTHY
  • MEMBER
  • 3 POSTS
Roy, that is interesting that AllData calls for the stant version. It looks like it has a sensor on the housing which would have nothing to plug into on the vehicle listed above per the install sheet you attached.
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Monday, November 15th, 2021 AT 2:59 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yes, it does not say Stant specifically, it says the temperature required for the thermostat.

Roy
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Monday, November 15th, 2021 AT 3:03 PM

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