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Topic Review (Newest First)
07-22-2015 08:43 PM
amc49 '...and for the first time since i've bought it...'

There's the problem. Trash in coolant seizes the stat up.
07-22-2015 04:35 PM

I just got the P0125 code and i just replaced the ECT Sensor. About to change the thermostat and flush it really well and for the first time since i've bought it am going to put the dealer recommended GOLD Coolant from Ford and see what that does. Has anybody considered the coolant being the problem?
09-05-2013 06:31 PM
Light came back on

For 7 months after I changed to the Ford thermostat the light and P0125 code did not appear. It came on and the temp indication did seem lower than normal. I changed the coolant temp sensor and now everything is the way I remember it being and the temp levels are consistant. In my case the coolant sensor was the probably the issue all along.
01-09-2013 03:28 PM
spatchel I no longer have a check engine light! I had the low coolant temp code (P0125) for the last month or so. I tried three different thermostats. The last one had the water temp gauge running just below half way and that was not good enough for the computer. As a last resort I bought a Ford thermostat from the dealer and the problem is gone. The aftermarket thermostas were rated at 195 F. They were Stant and Duralast. The Ford unit has 92 C stamped on it, which is just under 198 F. My suggestion to anyone changing a thermostat is to spend the extra money on the Ford one. It was $16 versus $8.
12-24-2012 10:38 AM
spatchel I just want to make sure I understand the system here. My 2003 SVT is giving me the P0125 code too. It is not running what I would call cold at just below the halfway point on the temp gauge. The thing I want to make sure of is that the sensor for the computer is the same as the one for the gauge. It appears the one on the thermostat housing is for the fan. I disconnected the sensor and the gauge did not change. I appreciate any help I can get with this. The car seems to run fine but that yellow light is something I can not deal with!
08-30-2012 07:02 PM
IH84DZ This code means your car hasn't reached 180* or so in a specified time. It means your thermostat is stuck open 99% of the time. You could also have some resistance in the ECT sensor or wiring. More temp = less resistance with thermistors so more resistance would make the PCM think it was a lower temperature.

The sensors measure poorly in air as well so a low coolant level may cause an air bubble to form near the sensor...but these aren't difficult motors to "burp".

I only have luck with Ford thermostats. I've had two Autozone stats stick open on me. I find the oil temp runs cooler than the coolant temp when this happens. Unless I really rev the motor the oil temp always was a little lower on the gauge.
08-30-2012 06:07 PM
pak7176 Has anyone else had this problem too? My 04 SVT just started throwing this code. Before this code I had the code for spark plug misfire in bank #1. Replaced plugs and wires. A week later, the p0125 code and engine light popped on. thermostat or temp sensor? or?????
08-27-2011 07:08 PM
Kauai Guy Bumping for info because I have the same problem and don't want to make a new topic. I just put in a new ECT a couple days ago and a new Thermostat a few months ago and I still have P0125.
02-12-2010 12:49 PM
Willislegend i replaced the sensor on the top of the housing, no change. Any suggestions!?
02-11-2010 08:55 PM
dirtbrown i got this code anyone else have any SVT has a brand new fuel pump and timing belt...after 300+ miles i get this code along with p0420
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