Ok this is my story..

I saw this ad on craigslist and it was for an 05 car. The add said GREAT PRICE want to sell today, so it had an amazing price and thought i should jump on this. So i called the individual, we met up, test drove the car, and everything seemed fine. So i called her the next day and said let’s do this!
The next day we met at a post office and got a note notarized basically saying that there is no debt on the car (because it was just paid off and the pink slip is being sent by the loan provider), that the pink slip will be given within two weeks, and also that if i crash the car it is my responsability. Ok so both sing, i give her the money, and she gives me the keys. So i take off from the parking lot and not even three street lights later the car starts over heating???
conincidence? I think not!
So i called her and said what’s going on? she said that has never happened to me, “it is a new car.”
I take it to the mechanic and they said that it has a potentially blown head gasket, and he said that definetly does not happen over night and especially in a series of minutes after a transaction.
So leading me to the conclusion, that
1 there was something wrong with the car before
2 she lied about the car not having anything wrong with it
3 the check engine light is on
4 it will not pass smog in california
5 it is a unsafe vehicle.. ON THE DAY OF THE TRANSACTION

so i had to get it towed to my house and i have all proof that i did not drive it that day (obviously a unsafe vehicle).

futhermore, it is by state law in california that the seller is responsible for the smog! (if a seller sells a car that does not pass smog, that is againts the law)

can anyone please help me or if i have wrong information about state laws, please help me!

(this just happened to me!)
i did read something about the dmv not having to smog a vehicle if it is not older than four years old. futhermore, i have the ad that says car is in good condition. From my knowledge, good condition does not mean a huge mechanical problem.