Tesla recalls 40,000 cars over power-steering fault- PublishedTesla is recalling just over 40,000 cars in the US because of a potential power-steering problem.Elon Musk's electric-car manufacturer says the vehicles' power-steering assist system may fail on rough roads or after hitting a pothole.Separately, Tesla is recalling 53 2021 Model S exterior side rear-view mirrors built for the European market that do not comply with American "rear-visibility" requirements.The Twitter effectAfter buying Twitter, Mr Musk has reportedly been working with software engineers from Tesla to look under the bonnet of the social-media platform.But his other business ventures appear to be suffering a knock-on effect, with Tesla investors continuing to sell off stock."