One method used in one of my diving equipment is to take one sensor and compare the value to the average to the other sensors, and if it's too far out, mark it

One method used in one of my diving equipment is to take one sensor and compare the value to the average to the other sensors, and if it's too far out, mark it as potentially broken. Cycle to next one and repeat. This can still situation where either a bad sensor is marked as good, or a good sensor marked as bad, so a human operator is still required to monitor the decisions made.