One of you guys can post again, I'm just gonna have Sklog sulk in the corner for a little longer.
So, obviously with techno-organic bots like Blackarachnia and Sklog, they have some sort of pain receptors due to their semi-organic nature, but I've always wondered about normal bots and such. I've always just thought of the metaphysical spark being able to somehow allow solid metals and stuff too feel using science-magic.
to be honest, I think that pain would be more a mental thing than anything else in regards to transformers. I remember specifically the team trainwreck comic posted on here where a little bot lost his legs or something like that, and considering that they don't seem to need their legs (or any real appendages for that matter) to function, visual stimuli would seem to be the best, if not the only way to tell if they were injured, unless, of course, the were hit in the chest or the head.
@ShiningSectorto this day, I still cannot believe that Weird Al's Dare to be stupid was in the first transformers movie. If that were me, I'd still be talking about this song and it's involvement in the movie until I'd die.