Focus Fanatics Forum banner

1 - 6 of 6 Posts

·
Registered
Joined
·
46 Posts
Discussion Starter #1
Hey guys, so my 08 will be going down the road running at normal operating temperature, and all of a sudden the temp gauge in the dash will slowly drop below C, and stay there for awhile, and then come back up (sometimes not all the way at first). It only does this once in a while, so I changed the thermostat/housing a few months ago, and I am having the same problem. Only now it has thrown a p0128 code for coolant temperature, any thoughts? How many coolant temp sensors are on this engine? And which ones give info to the ecu or gauge in dash? Thanks!
 

·
Vince your Moderator
Joined
·
5,074 Posts
Check the Cylinder Head temperature(CHT)sending unit and the pigtail for any cracked or, pulled(bare)wires.

Post results
 

·
Premium Member
Joined
·
44,595 Posts
Both, AFAIK the gauge is fed off the PCM.

Some of your model have a sensor by the thermostat as well, and I'm actually not sure of it's function since not all use it.
 
1 - 6 of 6 Posts
Top