Assuming the party-list system. It depends on how high the party has placed him on the list. If you vote for a candidate so low on the list that he probably wouldn't be elected, he might get enough preferential votes to oust out the last person on the list that would normally get a seat through the top-down assignment, but that only really works for getting someone in, not to get someone out.

Better vote for another party instead.

With the party-list system, you generally vote for parties and not for persons.