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my check engine light is on. i did a diagnostic check on it and nothing was wrong with. can you tell me why.

Answers from the Automotive Experts

Colleen McGee, Driving Instructor at Americas Driving School Hi Lorraine! It might be a bad sensor for the light.

Kristin Brocoff, Director of Corporate Communications at Loraine, although it may seem like there is nothing wrong with the car, the check engine light rarely goes on for no reason. It could be something really simple and affordable to fix such as a loose gas cap. But more likely it's something like a faulty oxygen sensor, which is the no. 1 reason the light illuminates on 1998 Saturns. If you drive with a faulty O2 sensor, it can negatively impact your fuel economy by as much as 40%. That's like wasting an extra $1.50 per gallon! I encourage you to get it looked at. A trusted ASE-certified tech can diagnose it. There are also consumer products such as the CarMD Vehicle Health System that can help you get to the root of the problem. Good luck! Kristin Brocoff,

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