As a mechanical engineer is there any coding that has to be done for certain projects?

There are certainly projects that do require coding. Engineers typically work in teams, so a variety of members of the team could be the ones to do the coding. It is good for mechanical engineers to have at least a rudimentary understanding of coding, even if they do not perform the coding in projects. If the coding is a substantial part of a project, typically someone with a computer science background would be the one with the expertise on the team to perform the coding. I hope this helps!