I have a 94 Nissan Pathfinder and the check engine light is on. I pulled the battery terminals to reset the light, that worked for a couple of weeks. The light came back on, pull the bat again, the light came back on again. I always make sure the gas cap is snug, so I am sure it's not that. I was going to change the Oxygen Sensor but it is a bit expensive and I don't know if that is what is causing the problems.
So, my question is, is there anyway that I can find out what caused the "check engine" light to come on?
If so, please reply Thanks Jeremy