My wifes 2001 bug service engine soon light came on today. I took it to our local parts store and they tell me it has to be low fuel pressure or vaccuum leak on the egine or a failed Ho2S. I have two questions does anybody have a clue what it might be, is there a common part that fails on this car. Second question, is it difficult to change a Ho2 sensor? My wife has 55,000 miles on the car.