P0128 - Engine not getting up to temperature

2009 FORD ESCAPE HYBRID
200,000 MILES • 2.5L • 4 CYL • 4WD • AUTOMATIC
Avatar
SLOTHY
  • MEMBER
  • 3 POSTS
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
Nov 15, 2021 at 6:24 AM
Advertisement
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 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
Images (Click to enlarge)
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Nov 15, 2021 at 11:17 AM
Avatar
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.
Images (Click to enlarge)
Attached Media
Attached Media
Nov 15, 2021 at 12:42 PM
Advertisement
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
The Stant one is what Alldata calls for. That is the higher temperature one I sent from Rock Auto.

Roy
Nov 15, 2021 at 2:55 PM
Avatar
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.
Nov 15, 2021 at 2:59 PM
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Yes, it does not say Stant specifically, it says the temperature required for the thermostat.

Roy
Nov 15, 2021 at 3:03 PM