Front Air Bag Sensor Control Problems of Ford Fiesta

This is my first new car and I thought I did a good job on my homework with the Ford Fiesta 2011 but I'm starting to have problems at 47,800 miles. First it was a recall on the "air bag" which I returned and the problem was fix as they stated. Secondly, I started notice from time to time the car would hestiate or get stuck in gear especiallly coming around corners. At one point the car was driving very sluggish and I express my concern to Ford and it was brought in immediately. The mechanic and myself took the car out for a test drive and as he drive he stated "I had to much air in the tires". . . . . . ( ?). On 7/8/13 the check engine came on and I'm thinking what could be the problem at 40,000+ miles once again I called Ford and immediately the car was taken in for service. I was told it a sensor issues and they would have to order the part but the car was safe to drive. Once I received my vehicle back I notice the check engine light was not on and the car was driving extremely sluggish and it seem to have no power. The car was taken back for service on 7/16/13 to have the sensor removed and it was placed w/ " rear oxygen sensor" as they stated. Looking back, once the sensor was replaced the car was not the same. It was little over a week the car was back at Ford due to wheezing, high pitched and faint sounds. The car performance was poor!!!! Ford stated the transmission. It still baffle me at 47,880 I'm having a transmission problem. . . . . . . I drove a rental provided by Ford until they fix my vehicle and I was given a call everyday rearding my vehicle. I pick up my vehicle on 8/2/13 and it stated " the tech removed and replace tranny" it doesn't say it new or extended warranty therefore I question the work that has been done on my vehicle?.

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