First, the definition of consensus from here:
5 net votes and at least twice as many upvotes as downvotes.
Suppose a meta question has two conflicting answers that are both a consensus (score at least 5, at least twice as many upvoteds as downvotes).
Examples: this one and this one
What to do?
1: Ask same question again
2: Choose the one with highest net score
3: Choose the one with most upvotes
4: Choose the one with least downvotes
5: Choose the one with highest upvote/downvote ratio
6: Say no consensus exists due to conflict.
This is not a dupe of What to do about a fluctuating consensus? as the linked one asks about a fluctuating consensus while this one is about two conflicting consensuses.