"Crappy" can be interpreted a lot of different ways. Without real symptoms, clues, and observations, it is impossible to know which way to start looking for the cause. Based on an oxygen sensor's values, the Engine Computer will modify fuel delivery a maximum of plus or minus ten percent. You will not likely notice that while driving but it will have an adverse effect on tail pipe emissions when the sensor is not working properly. If you have a misfire condition, sluggish performance, or stalling problems, the oxygen sensor has nothing to do with that.
Wednesday, November 24th, 2010 AT 7:45 PM