little help

red99pony · 11-27-2012, 05:40 PM

my 02 lightning is throwing obd2 code p0125 Insufficient Coolant Temperature for Closed Loop Fuel Control. I changed the thermostat for a new one still throws the same code. from what i have read it is either and ECT sensor (engine coolant temp) or CHT (Cylinder head temp sensor). my gauge shows that the temperature is fine so i think i need to change whichever sensor doesn't control the gauge since it reads correctly. does anyone know which sensor controls the gauge or has anyone came across this before?

thanks

ElecTech · 11-27-2012, 09:42 PM

Those codes tend to be more common in the cold months on cars with lower temp thermostats and lower fan settings. It's not necessarily a sign of a bad sensor. The PCM is looking for a minimum threshold to be reached, sometimes there is also a time window involved, and if the engine is slow to come up to temperature, you can sometimes get a code.

This may be a potential explanation if all systems seem to check out.

red99pony · 11-27-2012, 10:01 PM

Quote:

Originally Posted by ElecTech

Those codes tend to be more common in the cold months on cars with lower temp thermostats and lower fan settings. It's not necessarily a sign of a bad sensor. The PCM is looking for a minimum threshold to be reached, sometimes there is also a time window involved, and if the engine is slow to come up to temperature, you can sometimes get a code.

This may be a potential explanation if all systems seem to check out.

my stat isn't cold it is 190. my fan settings are stock and my engine heats up fast. i appreciate the feedback though. i had the code deleted and went into walmart for a short time. when i came out it threw the code again right away and the engine was still warm at that point. that is what is also making me lean to a bad sensor but i could be wrong.

ElecTech · 11-27-2012, 10:57 PM

But you may be right!

bgstew6 · 11-28-2012, 07:53 AM

we have a CHT not ECT...located in driver side head, inboard (under lower intake manifold) between cylinder 5/6,

DolSVT00 · 11-29-2012, 02:00 PM

Wait longer on a cold start before driving, or dont beat on it while its cold is the translation for that code. The gauge reads off the sensor you suspect is bad, if the sensor is bad, the gauge wouldn't read. (BTW its a PITA to change that sensor with the lower intake, alternator and pulley bridge still on)

Check and make 100% positive your T stat is what you say it is. Factory is 180.

red99pony · 11-29-2012, 05:55 PM

Quote:

Originally Posted by DolSVT00

Wait longer on a cold start before driving, or dont beat on it while its cold is the translation for that code. The gauge reads off the sensor you suspect is bad, if the sensor is bad, the gauge wouldn't read. (BTW its a PITA to change that sensor with the lower intake, alternator and pulley bridge still on)

Check and make 100% positive your T stat is what you say it is. Factory is 180.

i drive it hard rarely, especially since it is all stock. i usually let it warm up but sometimes not. i have gotten it off an on over the years last time i changed the thermostat and it went away for a couple of years plus my gauge read low all the time i knew that one was bad. i don't think this one was bad but i changed it just to see. it is a superstat i got from advance i will recheck the temp on it. thanks

red99pony · 11-29-2012, 06:37 PM

turns out it wasn't the same code again. it was a different one all together that had nothing to do with coolant. thanks again

11-27-2012, 05:40 PM	#1
red99pony Senior Member Join Date: Jul 2009 Location: goose creek sc Posts: 818	little help my 02 lightning is throwing obd2 code p0125 Insufficient Coolant Temperature for Closed Loop Fuel Control. I changed the thermostat for a new one still throws the same code. from what i have read it is either and ECT sensor (engine coolant temp) or CHT (Cylinder head temp sensor). my gauge shows that the temperature is fine so i think i need to change whichever sensor doesn't control the gauge since it reads correctly. does anyone know which sensor controls the gauge or has anyone came across this before? thanks __________________ 02 lightning all stock 99 mustang gt Tork Tech terminator kit making a little boost

11-27-2012, 09:42 PM	#2
ElecTech Senior Member Join Date: May 2009 Location: Charleston, SC Posts: 1,489	Those codes tend to be more common in the cold months on cars with lower temp thermostats and lower fan settings. It's not necessarily a sign of a bad sensor. The PCM is looking for a minimum threshold to be reached, sometimes there is also a time window involved, and if the engine is slow to come up to temperature, you can sometimes get a code. This may be a potential explanation if all systems seem to check out. __________________ Jaime

11-27-2012, 10:57 PM	#4
ElecTech Senior Member Join Date: May 2009 Location: Charleston, SC Posts: 1,489	But you may be right! __________________ Jaime

11-28-2012, 07:53 AM	#5
bgstew6 Senior Member Join Date: Jan 2009 Location: Summerville, SC Posts: 444	we have a CHT not ECT...located in driver side head, inboard (under lower intake manifold) between cylinder 5/6, __________________ 2k2 Black Harley Davidson SCrew, #1088 21lbs of Pure, Cogged, Kenne Bell Screamin Hell! Touched by the Hand of DolSVT "If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle." - Sun Tzu

11-29-2012, 02:00 PM	#6
DolSVT00 Moderator Join Date: Jan 2007 Location: Goose Creek Posts: 3,913	Wait longer on a cold start before driving, or dont beat on it while its cold is the translation for that code. The gauge reads off the sensor you suspect is bad, if the sensor is bad, the gauge wouldn't read. (BTW its a PITA to change that sensor with the lower intake, alternator and pulley bridge still on) Check and make 100% positive your T stat is what you say it is. Factory is 180. __________________

11-29-2012, 06:37 PM	#8
red99pony Senior Member Join Date: Jul 2009 Location: goose creek sc Posts: 818	turns out it wasn't the same code again. it was a different one all together that had nothing to do with coolant. thanks again __________________ 02 lightning all stock 99 mustang gt Tork Tech terminator kit making a little boost

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