i used the seach but cant find where the ECT sensor is on my 2001 screw with the 5.4..... have a haynes book and still can't find the damn thing!! any help would be great. Thanks!!

 

Your 01 doesn't have an ECT sensor. It uses the CHT for that. Only the 4.2 V6 uses one. That may be where the confusion comes from.

Regards

Jean Marc Chartier

 

Yea, it was eliminated in 99 on the 5.4L's. They programed the PCM to do all the math thru the CHT Sensor. The 97 -98 5.4L used both ECT and CHT Sensors.

 

well ****... so if i'm getting that p0125 code should i just change the thermastat?/ it has a poor idle @ start up but it's not kicking warm air out of the vents????? or should i try that CHT sensor? if so is it easy to find?..

 

PO125- If the coolant level is ok. I would replace the thermostat.


The CHT Sensor is under the intake maninfold driver-side head toward the front. That white plug on the right -

 

Does the rad hose get hot? Check the coolant level. Either the t-stat is stuck open, most likely as there is no heat in cab, or the CHT circuit/sensor is faulty.


Regards

Jean Marc Chartier

 

Just replace the thermostat. It's getting lazy and is not allowing the coolant to come up to temp within the alllotted time given by the PCM's programming.

Most common reason for a P0125.

Steve

 

i'm going to change the thermostat tomorrow.... Thanks for the help!!