COLORADO SPRINGS, COLORADO -- I bought a 2007 Nissan Sentra at South Colorado Springs Nissan from one of the sales people there. He stated the MASS AIR FLOW sensor was out in the car I was looking to buy. He said he would take one from another Sentra and when the new part came in he would then give me the new part and replace it. Mind you I have this all in writing on my contract. Well I called several times and the sales person kept stating that it is still on a national back order. Finally I called the parts dept and they stated they had not one but 2 of the mass air flow sensors and that it was never on national back order. I called my salesman again and asked if the part was in and he quickly stated .."NO". I said well your parts dept states different. Well needless to say he told me to set up and apt and he would have the part switched out. He sent an email stating to find him so he could pull the car into service. I came in found him and told him I would need a receipt. He stated, "I will write something up for you" I told him nope that will not be good enough. I need something from service that states they worked on my car. With that I left. Not 10mins off the lot he calls and leaves a VM stating, "come and get your car". I tried calling back and he was of course unavaliable. He then called me back 20mins later stating, "it was never the mass air flow sensor it was the inteligent key sensor". So upset I head back to the dealership. Not only did they lie to me from the word go, they were going to pretend they fixed the part. I have a writen contract stating I am intitled to the part and they will not give me the part. I went to the GM of the dealership and got nothing but attitude, when I asked for his manager he says, "I'm on top in here I'm the boss." Well I will NEVER EVER buy another Nissan nor ever take my car to South Colorado Springs Nissan for service. This problem is not resolved and I will not give up until I get my part.