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Q: Would a tune up resolve the "check engine" light problem? on 1994 Suzuki Swift

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Check engine light came on when driving to work. Stayed on when driving home. I could not detect any other problems.
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Thanks for your reply, I appreciate your help. It helps to have a second opinion. I was told that it might be that the gas cap might be loose. I have a gas cap that locks. I looked at it, cleaned it & twisted it back on. The check engine light seems to be dimmer. What do you think?
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Its either on or off. If the cap was not loose you probaly still got a problem. Some of the chain operated parts stores will hook up to your car a get the fault code for you. If you can get that code and get back to me I will see if I can help you more.