Well two things.

One man up. YOur 18 and should be lucky your folks support you. They're going to find out either way and you'd be an idiot not to tell them.

Two, get a lawyer and hope that you can get the ticket changed to "Faulty Equipment" after all, if your crap wasn't working right, and still isn't, a trip to the dealership for some good documentation and a high bill would help you, plus taking DD would strengthen even more that you did not mean for it to happen.

Either way, you need to be up front, handle your business and try to fix the problem. Lying or deceiving isn't going to help you in the long run.