Engine P0128 Code On 2004 Mustang 3.9l V6....help.

Hi folks,
I am new to the forum here. Driving home my check engine light came on my 2004 Mustang 3.9L V6, but the car ran fine all the way home. No sputtering or hesitation at all. I went out and bought a code scanner to diagnose and the pic attached is the code that came up. I'm hoping you forum folks might be able to give me some guidance as to what needs to be repaired. I read a few websites that discuss cylinder head temp sensor and also engine coolant temp sensor replacement. Does a 2004 V6 have both these sensors, and could they be the culprit(s)? I did replace the thermostat about 2 years ago due to an overheating situation. Thanks everyone, and I look forward to hearing your input.

Thanks so much for the info. I was watching all the dash gauges while I drove home with the check engine light on, and the temperature gauge stayed steady at the normal operating temp. Where on the engine would the CHT be located? I did a good look around under the hood this morning and could not find it at all. I'm guessing Ford hid it nicely and in a difficult place to access/replace?

OK thanks again. I'll take a look tonight and hopefully locate it. Sounds like it might be "fun" to access/replace if needed.