Can I make a dealership buy back my car?

I bought a 2006 Mustang a year ago from a used car dealership here in Reno NV. At the time everything was great. Everything was in line with the contract and the bank. Come a year later when it was time to register the car again; a smog was required. The car was 'rejected.' Four times. I had a feeling it had something to due to a possible custom tuning to the vehicle computer, which I did not do. Hence it was done prior to me buying the car. I took it to a local performance shop and sure enough, there is a custom tune on the car making the car be rejected at a smog check. With this custom tune there is no way it would have ped smog legitimately. Like I said before, when I bought the car everything was in line including the required smog check, which I now believe was falsified. Would this false smog constitute as "false representation" giving me the right to have the dealership buy back the car?