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In the 2015 Chevy Impala, potential causes for the check engine light to illuminate include a loose gas cap and a faulty radiator. Various engine issues may arise, such as a spark plug dislodging or a loose gasket requiring tightening. Prompt repair of oil leaks is essential, as is addressing engine overheating to prevent potential fires or explosions. Watch out for excessive oil consumption, necessitating more frequent oil changes. It's recommended to change the coolant every 60,000 miles and replace the air filter every 15,000 to 30,000 miles. Spark plugs should be replaced every 100,000 miles unless they are copper, in which case they should be changed every 30,000 miles.
The reason why the check engine light is illuminated in a 2015 Chevy Impala is most probably because the gas cap is either loose or not working properly.