BAS-ESP light goes on.

What is your question?

At first, I would turn the steering wheel all the way left, then all the way right, and shut off the engine for about a minute, then when I turned the engine back on, the "BAS-ESP" light was off. But now, the light stays on, no matter what I do. Even with this warning light on, the car seems to run just fine. Should I worry and stop driving the car? What does this "BAS-ESP' mean?