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Topic Review (Newest First)
09-05-2013 07:31 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 04:28 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 11:38 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 08:02 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 07:07 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 08:08 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 01:49 PM
Willislegend i replaced the sensor on the top of the housing, no change. Any suggestions!?
02-11-2010 09:55 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
02-11-2010 07:41 PM
Willislegend ok, well because of limited money and freakish snow in dallas i have not fix anything. I bought a new therm and looked at the old one, looked like it wasnt stuck in the open position, it was closed when i took it out. so thinking about buying and replacing sensor...idk
02-11-2010 12:28 PM
cowboy ive changed both the sensor and the thermostat and I still have the check engine light on with the same code
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