Mercedes Benz S550 ABS Wheel Speed Sensor

I Was Taking Off On Gravel And All The Lights Came On. Checked And It Says Left Front Wheel Sensor, Checked Speeds And All Move Except It. I...

All Lights On The Dash Of Course, Have A Code 511700, Is It Usually The Sensor? I Scanned It And Drove, And It Is Not Reading, The Others...