Manifold/header/muffler/tail Pipe problems of the 2013 Nissan Sentra

My wife was driving on interstate 15 as we left san diego, California. In the car was my adult daughter and my two granddaughters, ages 1 1/2 and 10 months. I was ahead of her in our Nissan pathfinder. She called my phone and said that the car rpm's were fluctuating and that the car wasn't going to make it home to twentynine palms. We pulled off the freeway in escondido. I checked the Sentra and found that in idle and park that the engine ran fine. When I drove the car, it was lurching like the transmission wasn't shifting correctly. After checking the engine compartment, I drove to a well lite parking lot and while the family ate, I called aaa and had the Sentra towed to mossy Nissan of escondido. On Monday the 22nd, my wife called mossy Nissan and told them what happened. They called her back saying that it wasn't the transmission, that a sensor had been taken off of the manifold by her husband or our mechanic. She assured them that since the car was only 13 months old and under warranty, no mechanic had worked on the car and that I had only done the oil changes, but had not worked on the engine. Mossy Nissan said that they would not honor the warranty since the sensor in the manifold was removed. I called mossy Nissan and told them that I had not worked on the engine, that no mechanic had worked on the engine and that the sensor had to have fallen off the car while my wife was driving it on the freeway. They referred me to Nissan USA, which said the same thing; that since the sensor was missing, they had nothing to turn in for warranty, so they would not honor the warranty. The price to repair the car was over $700, as they said I needed a complete manifold with the sensor attached. After repeated calls, mossy now said that my car will be repaired by 1/17/15 and the price will be under $500 because I had to wait for a part from the factory.

I previously filed complaint, but was now told by the dealership that after the manifold was replaced, that the transmission also needed to be replaced. More waiting time, more unanswered phone calls, more poor service from the dealership. The Sentra broke down on 12/20/14 and I'll finally be able to pick up my car on 1/24/15. Nhtsa id number: 10672846 summary: my wife was driving on interstate 15 as we left san diego, California. In the car was my adult daughter and my two granddaughters, ages 1 1/2 and 10 months. I was ahead of her in our Nissan pathfinder. She called my phone and said that the car rpm's were fluctuating and that the car wasn't going to make it home to twentynine palms. We pulled off the freeway in escondido. I checked the Sentra and found that in idle and park that the engine ran fine. When I drove the car, it was lurching like the transmission wasn't shifting correctly. After checking the engine compartment, I drove to a well lite parking lot and while the family ate, I called aaa and had the Sentra towed to mossy Nissan of escondido. On Monday the 22nd, my wife called mossy Nissan and told them what happened. They called her back saying that it wasn't the transmission, that a sensor had been taken off of the manifold by her husband or our mechanic. She assured them that since the car was only 13 months old and under warranty, no mechanic had worked on the car and that I had only done the oil changes, but had not worked on the engine. Mossy Nissan said that they would not honor the warranty since the sensor in the manifold was removed. They referred me to Nissan USA, which said the same thing; that since the sensor was missing, they had nothing to turn in for warranty, so they would not honor the warranty.