This article advances the thesis that our values and beliefs about engineering critically impact the teaching of engineering ethics, and our representations and assumptions about engineering are, accordingly, ethical questions we must consider. To illustrate how in broader sociohistorical contexts, different understandings of engineering have shaped expectations of ethics, we provide a historical and contemporary review of the literature. Examining the significance of our thesis for teaching practice, we discuss three case studies of our teaching and critically reflect on how (...) our representation of engineering limited the breadth and depth of ethics. Considering that instruction seemingly unrelated to ethics, in fact, influences how engineering ethics is understood and taught, our conclusion calls for critical examination of our beliefs about engineering. This entails, among others, up-to-date knowledge about the changing values of our rapidly-developing engineering fields and how they raise social, ethical questions of engineering relevant specifically to our teaching situation. (shrink)