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it's not a false alarm. It usually means something in the emissions equipment is bad. Mine came on once for a vacuum leak. Some cars allow you to input a code via the ignition and the light will give up the code(s) by flashing. Online, Google OBD II diagnostic codes and you'll find the meaning, although it may or may not tell you what you need to know.
Primary culprits are gas caps, O2 sensors and vacuum leaks. Usually. The free diagnosis is a good thing, let them tell you the faults and if you can make sense of them, fix away. If not, I took mine to a mechanic friend in Cherry Hill (plug plug) at John's Car Care.
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Never be afraid to tell the world who you are. -- Anonymous
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