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Trouble code P0128 on a 2006 Fusion, 2.3 L engine. What is the most common problem, the thermostat or the temperature sensor?

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Thermostat is honestly the most common issue with this code on this vehicle. I have seen one or two sensors but more than likely it is the thermostat is stuck partialy open.

Posted on May 23, 2011

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Posted on Jan 02, 2017

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Were is the coolant sensor on the 2006 ford fusion my engine light keeps popping on and I have checked for codes and it tells me a PO 128 code. were would this be located


I found this location for 2.3L
Two wire connector and you can see wire colors. I didn't know the question has already been answered. I had already looked up the info, I figured I might as well post it. I wasn't sure of engine liter size?

coolant-sensor-2006-ford-fusion-engine-osju3jyrnymnvvv3fl51m10w-1-0.jpg

coolant-sensor-2006-ford-fusion-engine-osju3jyrnymnvvv3fl51m10w-1-2.jpg

Dec 04, 2016 | Ford Cars & Trucks

2 Answers

How to change engine cooling sensor on 2007 ford fusion


To begin, this year fusion had some issues with overheating problems which seem to be solved by 'bleeding' the coolant system of all air. Historically, an air bubble will become superheated and cause the temp needle on the dash to rise suddenly. This is often mis-diagnosed as a bad sensor, so initially be sure that the system is free of any air and is completely filled with coolant. http://www.fordfusionforum.com/topic/10969-engine-temp-gets-hot-sporadically/ If you do find that this does not solve the problem, and you determine that a sensor replacement is called for, it is always helpful to provide the engine size. The most popular engine was the 2.3 liter, 4 cylinder. If that is your motor, then it has two temp sensors. One is the cylinder head temp sensor and the other being the coolant temp sensor. If you have trouble code P0128, then this could be a result of a stuck thermostat, bad connection to the sensor or a bad sensor as you have determined. The reason I am providing all of this information is that you should eliminate other simple problems before replacing sensors. The temp sensor is located as an attachment to the water outlet adapter on the lower radiator hose. It is identified as part #19 in the attached diagram. http://www.autopartslib.com/2007-2-3l-ford-fusion-radiator-components-parts-diagram/ and is a threaded component. It sells for about $20. A pic of the part can be seen here: http://www.1aauto.com/coolant-temperature-sensor/i/1atsu00022?f=831037&y=2007&utm_campaign=gb_csv_br&utm_content=TSU&gclid=CPe2j_a7zr4CFdRj7AodJQoAvg. Again, I am guessing as to your motor size. Other sizes will have different applications. Good Luck!

May 28, 2014 | 2006 Ford Fusion

1 Answer

2004 trailblazer code po128


P0128:
P0128 OBD-II Trouble Code
Technical DescriptionCoolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

What does that mean?This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.

CausesA code P0128 may mean that one or more of the following has happened:

Low engine coolant level .
Leaking or stuck open thermostat .
Faulty cooling fan (running too much) .
Faulty coolant temperature (ECT) sensor.
Faulty intake air temperature (IAT) sensor .Here's a link on replacing your thermostat.

Feb 06, 2013 | 2004 Chevrolet TrailBlazer

1 Answer

Po128 how to cure the problem code


Trouble Code: P0128

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

Possible Causes:


Insufficient warm-up time.Low engine coolant level.Leaking or stuck open thermostat.Inoperative engine coolant temperature sensor.Inoperative cylinder head temperature sensor.Here are the reasons.

Jan 14, 2013 | 2003 Ford Explorer

2 Answers

What is error code P0128 on 2006 Ford Fusion SE, 4 cyl, auto


P0128 is the fault code to check 1.the coolant level 2. thermostat defective 3. ECT (engine coolant temperature) sensor defective

Nov 13, 2010 | 2006 Ford Fusion

2 Answers

How do you fix a P0128 code on a 2006 Ford Fusion?


Upstream HO2S Sensors Swapped or this one
P0128....Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) now if this a 2006 model built for the europeon market then your code reader is a waste of time as it will never read the correct codes and if your really lucky it could lock up the immobilisor as well this is to prevent general garages from doing any repairs so just take it back to a ford garage

Jul 30, 2010 | 2006 Ford Fusion

1 Answer

I have a 05 chevy trailblazer, the check engine lite is on and a hand held analyzer indicated problem codes: PO410 $ PO128 any ideas? Wayne C


P0410

Definition
Secondary Air Injection System fault
Explanation
The air injection system is monitored for faults
Probable Causes
1) Circuit relay defective or fuse open
2) Check connector and wiring
3) AIR pump defective or hoses blocked


P0128
Fault Code Definition
  • Engine temperature has not increased and/or reached the correct level within a specified amount of time after engine startup
Common Problems That Trigger the P0128 Code
As for the po128 I would replace the thermostat first. That is the problem 99% of the time.

Good Luck

Jul 12, 2010 | Chevrolet Chevy Cars & Trucks

2 Answers

My engine light is on and the faulty code is P0128, what is this mean?


Trouble Code: P0128

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
Possible Causes:


Insufficient warm up time Low engine coolant level Leaking or stuck open thermostat Inoperative engine coolant temperature (ECT) sensor Inoperative Cylinder Head Temperature (CHT) sensor

Dec 04, 2009 | 2004 Ford Focus

1 Answer

2003 VUE-how do i locate/replace coolant temperature sensor


Its on the drivers side of the engine below the intake manifold. Why do you want to replace it? I have worked with the VUE since day one and I have yet to see a bad coolant temp sensor. If you are having trouble with the engine temperature or the amount of heat in the car a very common cause is the thermostat sticking open and not alowing the engine to reach operating temperature. The most common telltale to this condition is usually the service engine soon light is on with a p0128 code stored in the PCM.

Nov 27, 2008 | 2003 Saturn VUE

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