First, in which area in California do you live? I may be interested in the car, I'm just north of L.A. Second, what code are you getting on your scanning device? Third, have you ever had the EGR valve replaced or cleaned out the track. (this can help with emissions) and fourth, California does (or did, you need to check online) have a buy back program for cars that cannot pass smog. The last I knew it was $1,500, with certain caveats. But if you want to try something really "out there" first, then try cleaning your Cat. There are two ways of doing this, the first is to have the gas tank about half full, then pour in a gallon of lacquer thinner and take a continous drive of about 200 miles. Sometimes that can clean the Cat. The other way gets messier, and that is to remove the Cat from your car and soak it overnight in some heavy duty dish soap. move it around a lot in there, and maybe do a couple of days of cleaning, since you done need to drive the car on a daily basis. When the code for a bad Cat comes on, it means the unit is only about 94% effective. It might not take much to get it to 95% and clean enough to pass smog. Good Luck to you, what ever you decide.