engine service light is on, what could the most basic problem be?
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2003 BMW 325i Question: engine light
Answer #1matte May 14, 2009, 10:35Master
That should get you started. The light indicates that there is a failure in your emission control system, and it could be anything from a loose gas cap to a failing sensor.
Answer #2Visitor, July 31, 2010, 14:01
The most basic thing could be a loose or bad fuel cap. Once I replaced mine, it went away.
Another could be a miss-fire. How long has it been since you changed plugs? Did you use the best plugs?