Good low impact exercise for losing weight?

WeaponZero
I need to lose weight, but nerve damage to my left ankle limits the type of exercise I can do. Because my ankle can just 'give out' at any moment, I can't do any exercises that require it to be relied upon to support weight. I can work my upper body just fine, but I need some good ideas for cardio stuff to lose weight given my bad ankle. Obviously running, jogging, high impact aerobics, and lifting weights with the legs is as well too. Any suggestions? So far the only one I can think of is exercise bike...
Good low impact exercise for losing weight?
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