Electrical Equipment problems of the 1996 Plymouth Breeze

I acquired a 1996 Plymouth Breeze in March of 2002. The day after I got the car, the "check engine" light came on. Since then, the light has come one a total of 4 times. Each time it has been fixed or looked at, the O2 sensor was the cause of the problem. On halloween 2002, I took my car in to get a routine oil change and to find out the cause of a ticking sound. The auto center (that was doing my oil change) said it was a rod bearing, but when I took the car to the dealership, they said that it was a flywheel. The car was repaired and 2 days after I pick up the car, the "check engine" light comes on for the 4th time. I am taking the car to the dealership and praying that this is the last time I will have to make any repairs for the same thing!!!.