Cylinder head temp sensor
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You will have to pull the intake and it is towards the back on the pass head. Here is a link for the sensor it is pretty cheap I would stick to OE on any sensors and then put some new intake gaskets on as well and maybe a new t-state while i was there.
https://www.bigdealford.com/oem-part...IFJlc3VsdHM%3D
https://www.bigdealford.com/oem-part...IFJlc3VsdHM%3D