Yes it is mostly what she is coded/programmed to feel so it is basically a software design to feel cold or hot, no matter how many sensors her skin or skeleton has (if her code isn't making a connection mimicking a nervous system with those sensors on the skin and/or skeleton), and that is the hardware part, the pain she felt when had the hardware issue and the MC was working around her code is probably hardwired coded so she can know when something is wrong or threatening her survival, no idea, just speculating. I guess the sensors she has are set and then programmed to feel touch or even pain when its a harder touch/hit for now.
Also I'm still not sure if Artemis is an android and is 100% artificial or have some organic parts and that would make her a cyborg, I'm more inclined for being an android with just a few details on the outside like the skin and how it would feel when others touch it but still probably is artificial.
Most probably I missed some details during the story (or my mind and memory wasn't focused on it and more on her behavior and funny quirks/actions lol), specially chapter 5 and 6, but I'm sure someone will correct me with a few story details or even renders/dialogue hahaha.