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If the check engine light is on in a 2002 New Beetle, it could indicate a variety of issues ranging from minor to serious, such as a loose gas cap, faulty oxygen sensor, or engine misfire. It's advisable to use an OBD-II scanner to read the trouble codes stored in the vehicle's computer, which will provide specific information about the problem. Addressing the issue promptly can help prevent further damage and ensure the vehicle runs efficiently. If you're unsure, consulting a qualified mechanic is recommended for a thorough diagnosis and repair.

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