2000 es eng. light

i ran the code today and came back with "Camshaft position sensor A Circuit (bank 2).

does anyone know what that means?
thanks

THe ECU has lost the camshaft position sensor input for cylinder bank 2 (the bank in the front of the car).
Either the sensor is unplugged, the wiring to it is bad, or the sensor is bad.

Test/repair the wiring, if that is fine, check / replace the sensor.

this gets even better, my sister takes the car in to the dealer and they say that the battery needs to be replaced. of course dealerships dont listen to what customers know so they keep the car to run more tests on it. when she gets the car back i would i test the sensors and wires?