[timetowinarace]

More often than not it's an oxegen sensor. If you have good oil pressure, good water temp, and your altanator-battery is working properly your not in bad shape. The light means a sensor is not getting the proper reading. This could be an engine problem or simply a sensor problem as with the ox sensor. Natural deposits cause them to fail. Bad spark plugs should not cause the light to come on. Not even a miss would do this. Of course, your not saving money by waiting to change them-especially with todays gas prices and extra wear on the engine.

Your mechanic is the one that has the proper diagnostic equipment to find which sensor is sending bad information and why. If money is an issue, as with most of us, I would feel fairly confident in driving the car for some time as it is if the above mentioned items are okay.

Time