another coolant temp sensor problem
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New User
Joined: Apr 2010
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From: orange county
another coolant temp sensor problem
hey guys i'm new to the forum and was having an issue. i have a '02 f-250 5.4 gas and i'm getting a code p0125. says coolant temp sensor not reading temperature for closed loop. also my temp guage isn't giving me a reading. so i was thinking that the temp sensor is bad so i bought a new one and went to change it out. well in my manual it's supposed to be on top of the manifold next to the thermostat housing but there is only a plug in it. no sensor. so my question is where is it? is there an alternate location or maybe a totally different issue that you guys might know about? help me out i'm baffled
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New User
Joined: Apr 2010
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From: orange county
i'm not so sure. i'll check it out but i think it's not reading a temp because the sensor is out. my guage isn't registering a temp either. a bad thermostat my engine would overheat not stay cold. and i mean below the "C" reading on the guage. the guage works it just doesn't register a temp.
Junior User
Joined: Sep 2009
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From: Charlotte NC
If the thermostat is stuck open it will not heat up enough to reach operatng temp. It is a lot easier to put a thermostat in your truck than pull the intake to install a new cylinder head temp sensor. I put thermostats in all the time for this code. Just my professional opinion. Take it or leave it.
Posting Guru
Joined: Aug 2008
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I agree but instead of just replacing the t-stat after it's been driven grab the upper radiator hose if it's not hot then there is your problem, have you checked your coolant level? and condition
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Elder User
Joined: Mar 2003
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From: Farms of Duplin County
It's very odd that you say there is only a plug where the sensor should be as that is what provides the reading to your gauge. Are you sure it's a plug and not a physically broken sensor? The CHT Art is referring to is under the intake manifold and requires the manifold to be removed to replace it.
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Thread Starter
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New User
Joined: Apr 2010
Posts: 8
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From: orange county
yeah the t-stat is opening. checked it out the hose gets hot. and it's definately a plug. need an allen wrench to remove it. about removing the manifold...is that a difficult job? does anyone know if maybe there is an alternate location for the ECT sensor?
Elder User
Joined: Mar 2003
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From: Farms of Duplin County
That's definitely strange as the manual only shows it being on the top in front of the manifold.
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New User
Joined: Apr 2010
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From: orange county
yeah the CHT is definately there. the coolant level is full and as far as the quality goes it could use a change out. i'll see about getting a temp measurement but cant guarantee anything because i don't have a t-mometer
Junior User
Joined: Sep 2009
Posts: 64
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From: Charlotte NC
A thermostat and gasket is $10.00 from autozone. It takes 15 minutes to install. I am 99.99999% sure it will fix your problem. You have come here seeking advise, do yourself a favor and take it.
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New User
Joined: Apr 2010
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From: orange county
so you think that will get my temp guage registering a temperature? even though the t-stat actually works? thanks!!!