Tesla Motors is learning that making trouble-free autos is no easy task. In this week's SAE Eye on Engineering, Senior Editor Lindsay Brooke looks at the American electric car maker and recent reports of problems with its Model S luxury sedan.SAE Eye on Engineering can be viewed at http://youtu.be/kgbdTHxuegw. Access archived episodes of the SAE Eye on Engineering podcast at www.sae.org/magazines/podcasts.