I'm not sure if it's been already mentioned, but the webcomic
Shortpacked! has a very detailed and interesting storyline of a sapient car being put into a fembot body, and adjusting to life as a humanoid being. The fembot, Ultra-Car, deals with relationships, mechanical asexuality but romantic interest, sweet pranks, and all sorts of experiences in the titular toy store.
If you've checked it out, what did you think?
All the comics involving her can be found here:
http://www.shortpacked.com/searchcomic. ... ar&page=11
Her human form starts at page 11, which is where the link starts.
