Product: Vehicle loan or lease

On Saturday, XX/XX/XXXX I bought an SUV from XXXX XXXX in XXXX only to discover on Monday, XX/XX/XXXX, when I took it to my mechanic in XXXX XXXX that it had a huge oil leak ( about 2 cups of oil was in the oil pan ), all tires were unmatched and there were several other problems. My mechanic wrote out the issues and stated that they did not recommend I buy the car. I returned to XXXX XXXX of XXXX and they offered another car but I felt it was too small for me. I said I had to think about it and would come back the next day. 

So the next morning, XX/XX/XXXX, I checked my computer and found a XXXX XXXX at XXXX XXXX of XXXX. I called to see if car was available and it was. I said I was an hour away in XXXX XXXX and would come right down to see it. I arrived one and a half hours later. When the sales person requested the car be brought around, lo and behold it had already been sold. I was not happy as I was hoping to quickly get a car to replace the SUV that I was going to return. XXXX then offered me a XXXX XXXX XXXX ( vin:XXXX XXXX ) The car looked brand new and only had XXXX miles on it. It did a great test drive.  I thought XXXX was too far for me to take car to my mechanic before I purchased it ( though I didnt think to ask ). We negotiated a deal, finally, but I had previously told them I felt I had been caught in a bait and switch, so that is why I thought they had worked so hard to get the payment down to what I could afford. For me to take the car that night XXXX had 2 employees drive the XXXX to XXXX XXXX and take another car also so they could get back to XXXX. I drove the SUV I was returning to XXXX  XXXX. The XXXX dealership said they had expected me to return the SUV so gave me no problem in cancelling the loan and gave me a check for my {$1000.00} deposit right then. 
The next day I took the XXXX to my mechanic. He found a weak battery plus 4 pending computer codes. ( see print out attached ). When I took the car back to XXXX XXXX they replaced the battery with a new one with no problem. However, XXXX XXXX had no idea why there were 4 pending computer codes for the car but said that the new battery would probably reset the codes and that if I were to have a problem it would show up within 50 miles, which is the distance back to XXXX XXXX. A week later I drove back down to XXXX XXXX to pick up license plates and emission sticker. About a week after that my check engine light came on for about 4 hours, then went off. This was in the evening. The next morning I called Nissan, talked to the service center, and explained the light was no longer on. I was told to bring it down and they would check it out. So I did. When I arrived, the service manager was irritable and said they couldnt check for anything as there was no light on. I stood my ground, explained my earlier phone call, and again pointed out the pending codes. He finally took the car back to check it. He came back to say they found nothing and that the Nissan machines are not set up the same way XXXX code machines were. He said if I had any more problems I should take the car to XXXX of XXXX. By this time I had put 400 miles on the car just driving 4 round trips from XXXX to XXXX XXXX within 5 weeks. 
My first payment was due XX/XX/XXXX. I made that payment on XX/XX/XXXX. The next morning I drive the car from the front of my apartment complex to the other side of our pool area. No problems. I get items from my garage, back my car out of a parking place and turn it a quarter turn in order to go forward out our gate. The car would not go forward, just revved. The car would only go backward so I backed it into a parking slot and called my mechanic, then had XXXX tow my car to the shop. The problem? The transmission needed to be repaired or replaced for between {$1200.00} to {$2000.00}. I called XXXX XXXX. They had the car picked up and towed to XXXX in XXXX. XXXX  quote to repair transmission was {$4900.00} and to put a new one in was {$5000.00}. I thanked them for the information but said I was not paying for it and to talk to XXXX XXXX. XXXX refused to pay for it, or get me another car, or even give me a rental car while they worked it out. That was when I told them I had stopped payment through my bank for my first car payment. They told me I could not do that. I also told them I had talked to the loan company ( XXXX ) who stopped all the auto-pays I had set up and noted the problem with the car and that I did not have it in my possession. I told XXXX I wanted to cancel the loan and they had no problem doing so. They just needed a form from XXXX and said it would not impact my credit as long as XXXX sent in the loan cancellation form. XXXX has refused to send it in telling me I can not cancel the loan. The General Manager, XXXX XXXX, on XX/XX/XXXXscreamed and yelled at me over the phone and said it would ruin my credit to not make a payment or to cancel the loan. They refused to find me another car or a rental car. We have not talked since. 
XXXX XXXX of XXXX. ( Dealer Number XXXX ) ( Contract number XXXX ) My mechanic also gave me a XXXX XXXX XXXX XXXX that was issued XX/XX/XXXX. It states that the XXXX XXXX XXXX, along with 5 other car types have a transmission issue if the car only goes backwards or have other shift issues. The problem is caused by the control solenoid valve assembly which must be replaced. If my small town mechanic could easily access this information so could XXXX XXXX. I contend that they knew of this transmission issue but they sold the car anyway. They do not want to cancel the loan as they would be left with this car and have to refund XXXX over {$8000.00}. Yet they have no problem, apparently, of trying to make a senior citizen pay an additional {$2000.00} to {$5000.00} to get a working car. You know, if I could afford to put {$5000.00} more in a car I would have bought a newer car!