It needs propulsion to get into orbit. On its current trajectory, without some delta-v, it would zip right by L2. Once in orbit, it needs propulsion to stay the

It needs propulsion to get into orbit. On its current trajectory, without some delta-v, it would zip right by L2. Once in orbit, it needs propulsion to stay there. It also needs propulsion for attitude control. It does have reaction wheels, but once those are saturated you have to spin them back down. The only way to do that without transferring all that momentum back to the rest of the spacecraft is to use propulsion to counteract it.