2005 P0128

[JoeyGentry]

Good morning! This code popped up.

Coolant was topped off. Is there a way to bleed it?

Most of my research points that if this does not cure it, I should change the thermostat, but it could be the temp sensor.

I appreciate anyone's input on how to further diagnose this issue.

Thanks!

 

[JoeyGentry]

Anyone? I noticed the temperature this morning got down to 170 °F after an hour driving on the interstate. Is this normal?

 

[Seph]

Sounds like a stuck/sticky thermostat. Not sure bout stangs, had to replace one on a mazda cx7 recently. It was a two man job but easy enough and the mustang's engine bay is much more spacious.

Also at least on a cx7 stuck thermo means engine runs too lean so get it replaced sooner rather than later.