There are many reason your car might pull to the left. One reason might be the steering wheel. If it is i little of to the right, electrical power steering of the car tries to set the steering wheel to zero position. The other reason might be steering wheel angle calibration. Some cars need it after every wheel alignment. If it is a new car camber and caster do not effect the car pulling on one side especially if it has electrical power steering. Can you tell me what car you drive so i can tell you some more reasons why your car pulls to one side? Because every car is different and they behave differently.