oxygen

As I was driving my car today the check engine sign came on and yes, I panicked. After checking with my mechanic to make sure it was ok to drive, and finishing all my shopping, I came home and surfed the web for answers. It seems that most likely the oxygen sensor has failed, although now that I think of it I will probably need to have the fuel filter replaced too. My poor little car can't breath properly, it needs oxygen!

Searching webpages for answers I came to this: "... the check engine light came on, so I checked the engine and it was still there! ... "