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Old 04 Jan 2010, 04:46 pm
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Default 2003 honda civic engine light?

The engine light keeps coming on in my car. It came on all of a sudden when I started my car the other day and it stayed on for 2 or 3 days and then it finally turned off. I thought it was just a fluke but it came back on today while I was driving. I don't notice anything unusual happening with my car other than it seems like it is working a little harder to speed up but other than that it seems fine. What could the issue be?
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Old 04 Jan 2010, 05:31 pm
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get it scanned at auto zone
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Old 04 Jan 2010, 06:31 pm
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the condition that is causing the light to come on is intermittant. the check engine light means that there is a condition that the engine management system has detected that could cause the vehicle to emit excessive emissions. There are over 150 conditions that can cause the check engine light to come on.































The way the self-test that turns on the check engine light works is that it tests all of the engine management systems when the test conditions are met. if a system or component fails two consecutive tests then the check engine light comes on. Then, if at any time after that the problem is not present on two consecutive self-tests the check engine light is turned off. when the problem is again present and it fails two tests again, the light comes back on. so your problem is intermittent meaning sometimes its there, sometimes its not.































it would be silly to try and guess which of the tests is being failed. However, each time the light comes on a code is stored to tell a techincian which problem was detected. you can find out the stored diagnostic trouble code by taking the car to any Autozone parts store and they will download the code for free. AAMCO transmissions also advertises that they will do it for free but then they may want to sell you a diagnosis once they download the code. many shops will pull the code at no charge. once you have the code you can put a post out to find out what it means if the shop or store can't tell you.































lastly, the one thing you do want to check is to make sure your gas cap is on tight. that is one thing that will cause the check engine light to come on intermittently. make sure the gas cap clicks three times when you tighten it. otherwise the system will detect that its leaking and put the light on.































hope that helps
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Old 04 Jan 2010, 08:31 pm
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get it diagnosed at auto zone
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