Car Sale in California I sold a car in AS IS condition and I even wrote on the…

Car Sale in California
I sold a car in AS IS condition and I even wrote on the Bill of sale that the car is sold as is including California Emmisions (smog) for the car. The buyer is now saying the car is not able to be smogged and wants his money back. Do I have to give back his money even if he knew it was as is condition and not registered or smogged with the Emmissions as as is directly pointed out in the sales agreement?

Car sale without transfer of title I sold my car on Ebay to a private party.

Car sale without transfer of title
I sold my car on Ebay to a private party. The other party took possession of the car soon after the sale. I gave the other party a completed bill of sale and notified the DMV of transfer of ownership. I cashed their check but have not paid off the car loan yet. They have not received the title for the car. Now a detective is attempting to contact me to ask questions about the sale. The detective is harassing my family at their places of business and other employees that work for them. He says he realizes this is a civil matter but want to talk to me before it becomes a criminal matter. My question is can this become a criminal matter or would it remain a civil matter?

Bought a car from private seller Found an ad online for a used car and it says…

Bought a car from private seller
Found an ad online for a used car and it says it runs well. Brought a friend with me, we test-drove it & made a quick check on it. I thought it run well. My friend said transmission was slipping, no other problem.I bought the car but after 5 days it broke down. The repair would cost me more than what i paid for. I want to sue the seller for fraud because he did not disclose the problems of the car in his ad. I want my money back. We have no Bill of sale/no receipt for the cash I paid. Do I have a strong case?

What to do?

What to do? Pulled over for not having insurance.
To make a long story short when I drove my car to go get registered and get insurance I was pulled over. I got a citation for not having insurance. After this experience, I decided that it would be best to just get rid of the car. So I am selling it. However I still have to go to court regarding my lack of insurance. My question is: would it be better to walk into court with a notarized bill of sale, or 2. get insurance for a couple of days and then cancel it after going to court, or 3. get both? I would rather not spend $100 on insurance for a couple of days as well as the fine, but will do what I have to.