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If the check engine light is on in a 2004 Chevy Impala, it could indicate various issues ranging from minor to serious, such as a loose gas cap, faulty oxygen sensor, or more significant engine problems. To diagnose the issue, it's best to use an OBD-II scanner to retrieve the trouble codes stored in the vehicle's computer. Based on the codes, further inspection or repairs can be determined. Ignoring the light can lead to decreased fuel efficiency and potential engine damage, so it’s advisable to address it promptly.

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3w ago

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