peugeot check engine light

Hello
My car is Peugeot 206 1.4 HDi
I parked the last car and it didn't start after 10 minutes. check engine light was on. I had to wait 30 minutes and then it worked.

but for 1 day that light was on, but there was no problem in the car.

the next day, on the way to the industry, that light also turned off by itself. I showed it to someone there, it was connected to the computer, the fuel temperature sensor was faulty.
he said it's not important and deleted the error.

this happened again yesterday. but after 5 minutes the car started.

this is my question: where is the fuel temperature sensor on the engine?
and if I open it myself and clean it or replace it if I buy it from the internet, will the error be resolved?

Hello, if you enter the chassis of the vehicle here, you will reach the information instead of the part.