Replacing the thermostat on a 2000 ford explorer 4.0

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P0401 is for EGR low flow P0401 EGR Insufficient flow test what this !

Yes I have an 04 explorer it is a little tricky to get to. You have to check it close, more than likely it is the plastic housing replace it and the thermostat now. It seems to be a common problem and like I said a little tight to get too. But I did mine in the carquest parking lot. Here is a youtube video I found.
Replacing Thermostat Housing in 02 Ford Explorer V6 4 0L upper and...

PO121 : TP Sensor Performance = The PCM supplies 5V to the TP sensor(throttle position). The TP sensor is a variable resistor that drops the voltage to about 4 volts at WOT(wide open throttle) to less than 1 volt at closed throttle. Some TP sensors are adjustable. others have a learn procedure to determine closed throttle. PO171 Fuel Trim System Lean = In closed loop the PCM adjusts fuel delivery based on H2OS 1 readings and is indicated by long & short fuel trim values. If lean the PCM will add fuel (fuel trim above 0%) & if rich the PCM will reduce fuel(fuel trim below 0%) PO128 ECT Below Thermostat Regulating Temperature = possible failed thermostat, low or empty on coolant, Engine Coolant Temp Sensor, Poor connection/Harness/Wires, faulty PCM Connection. I think you hit the nail on the head , the ECT Sensor ( which is different than the temp sensor for the dash gauge)

1. 1 Drain the coolant from your Explorer into an adequate container by opening the drain plug at the bottom of the radiator. Save the coolant for reuse if it is relatively new and clean.
   
2. 2 Remove the negative battery cable from the battery if your Explorer has a 2.9-, 3.0-, 4.0- or 5.0-liter engine. This step is not necessary for 2.3- and 2.5-liter engines.
   
3. 3 Follow the upper radiator hose to the front driver's side of the intake manifold, where it meets the engine. This is where the thermostat housing on your Ford Explorer is located. If necessary, remove the air cleaner duct for easy access to the housing.
   
4. 4 Loosen the clip on the end of the radiator hose and pull the hose off the thermostat housing. Use a 10mm wrench or socket to remove the two retaining bolts on the thermostat housing cover. Remove the cover.
   
5. 5 Note the position of the thermostat before removal. Pull out the old thermostat. Seat the new thermostat inside the housing in the same position as the old one, spring-side facing into the engine. Install new gasket over the thermostat.
   
6. 6 Reattach the thermostat housing cover and the radiator hose. Reinstall the air cleaner duct if removed earlier. Fill the radiator with reserve or new coolant. Start your Explorer and run with the heater blowing until the engine gets warm. Check for leaks.
   

Read more: How to Change the Thermostat in a Ford Explorer ' eHow.com http://www.ehow.com/how_4484916_change-thermostat-ford-explorer.html#ixzz1CLSvmPwR

hi if you how comes you know it stuck open if you carnt find it please give me more imfo

sounds like the thermostat gasket is leaking. Might as well change the thermostat and gasket at the same time. make sure the hose clamp is tight sometimes it needs to get tightened up. could be lealking from the hose and running down.

the open pipe that you took the hose off of is the thermostat housing, you will need to remove this to reveal the thermostat, make sure you use a new gasket with sealant when reinstalling thermostat housing to prevent leaks and dont over tighten the bolts,run both bolts down as far as you can before final tightning

You will need a 20 star bit screw driver and a tool to take off your radiator hose.Their are 4 screws on the front of your thermostat housing . Make sure your car is cool for at least an hour And you will Probably need to unclamp the top hose running to the thermostat housing.And Probably the hose up under the housing.Then with the 20 star bit screw driver unscrew the 4 screws in front of the thermostat housing.When you get the front of the thermostat housing off.The thermostat is right inside pull it out and replace.

your fan clutch could be bad.