Could Previous Breast Augmentation Have Caused Tingling Leg?

The medical grade silicone in breast implants is nontoxic, so it just isn't possible that the tingling is related. If it continues you should have it evaluated to see what the cause is though.

This would be very very unlikely. There would no evidence that is currently available that would implicatee silicone or silicone implants as the cause of your condition.
However, there may be other events in the operative period that could have contributed to this. Any pressure on the nerve can cause tingling. Given the location of your surgery (away from your leg) it is unlikely that any sharp injury did damage. Therefore your nerve should be intact and recover from any prolonged pressure to it. However there are other causes that could be completely unrelated such as a "pinched" or compressed nerve in your spine, vascular problems, etc.
Discuss this with your primary care physician.

Hi there-

It sounds like your leg has been tingling for 6 weeks and your augment was only 2 weeks ago?
I would think that means your tingling has nothing to do with your surgery. If the timing you describe is not exact, and your tingling started after your surgery, I would talk to your surgeon... If it is accurate, and you had tingling before the surgery, you should see your medical doctor and possibly a neurologist.
Hope it gets better soon.