If your Lkas is not working, there are a few potential reasons why. First, check to make sure that the system is turned on and properly calibrated. If everything looks good there, then it's possible that your car's software needs an update. Alternatively, there may be an issue with the sensors or camera that Lkas uses to detect lane markings. In any case, it's best to take your car to a dealership or qualified mechanic to have them diagnose and fix the problem.