what could happen? They have a whole team of engineers on it....

In 1999. The Mars climate orbiter, a one hundred and twenty five million spacecraft was lost because of a mismatch between meters and feet. Lockheed Martin who designed and operated the craft for Nasa operates in english units. Nasa since the 1990s uses meters. After a 286 day flight the spacecraft  fired it's engine late and caused the craft to plunge deeper into the planet's atmosphere then designed to operate.
 It caused the orbiter to plow through the atmosphere and back into space. Where Nasa believes it "could"  now be orbiting the sun.
                                                              Think of that.........