[jamesliudotcc]

And there is plenty of bad philosophy out there. At a first approximation, avoid anything to do with the continental side of the analytical/continental divide. I say this as someone with a BA in philosophy from an analytic institution (Chicago) and an MA from continental (New School).

Another reason engineers should study philosophy is that philosophy departments take logic seriously. Talking with CS majors, their logic background is a few weeks in a discrete math class. I had two quarters, covering Godel's proof of the soundness and consistency of first-order logic (so 20 weeks total). If I had the appetite, I could have taken another two, for the incompleteness theorem, and modal logic.

If you are looking for a place to start, I recommend Grayling's Philosophy 1. It's an edited collection of introductory essays written to be understandable by beginners, but deep enough for philosophers in other subdisciplines. The best way to read it is to skim through the essays until you find one that is interesting to you (they don't much depend on each other) and then read that one carefully, and if it still holds your interest, chase down the references. Think of it as building a heuristic for A* search. Philosophy only gets good once you dig deep into a subject, and so you really need to find something in it that speaks to you.

Specifically for engineers, Philosophy 2 has an essay in it titled Philosophy of Psychology, which covers logic gates and Turing. Philosophy 1 is not a hard requirement for Philosophy 2, though I recommend at least skimming the Philosophy of Mind essay in 1.