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My MacPro Late 2013 was starting to run a little warmer to the touch than usual, so I ran TechTool Pro 14 which identified one of two temperature sensors to have failed. Are the individual sensors serviceable and can anyone recommend a parts source? If the sensors are bundled within a component assembly, would that component be the fan assembly and would the entire fan assembly need to be replaced, and again, would anyone have a recommendation for a source for the fan assembly? Thank you. Update (11/05/2021) Good morning and thank you, Dan. I am located in the USA, to answer your first question. In response to your first suggestion, I followed both methods that you mentioned. The onboard diagnostics came back reporting no problems, and TG Pro’s paid version also reported no problems. The screen shot is attached below. I am at loss as to how and why TechTool Pro 14.1, running under MacOS 12.0.1, and my physical touch would point to a problem, but now two other software applications would contradict that. Any guidance and suggestion from anyone would be greatly appreciated.

Yes, No and Maybe! Without knowing what you are facing we just can’t answer. I find TG Pro free version gives us a good run down on the sensors, if you get the full version you can get a deeper data on the sensors. Or you can use the onboard diagnostics to see if a hard error pops. Restart your system and press the D key. Reference: Mac startup key combinations In either case we need better data, post a snapshot of the main window of TG Pro making sure all of the sensors are visible so we can see things Adding images to an existing question.