In the US anyway, calling yourself an "engineer" is only regulated if you sell your services to the public as one. Inside of a business, like a car manufacturer, the position title of "engineer" can be applied to any job at all, however the business wants.

As a degreed engineer myself, this was a bit jarring to me when I first entered the workforce, seeing co-workers who had never been to college calling themselves engineers. But fortunately I got over it.