Check Engine Light Due to Gas Cap Issue on Chevrolet Prizm

A Loose or worn gas cap may cause Check Engine Light to illuminate.

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Average mileage: 72,750 (15,500–130,000)
5 model years affected: 1998, 1999, 2000, 2001, more2002
7 people reported this problem
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2001 Chevrolet Prizm 15,500 mi,
Check engine light: apparently something to do with where you put the gas in.... emission code; have noticed slight decrease in mileage, but still averaging 36-38 mpg city/highway. It is NOT due to the gas cap... the guy told me I would need to replace the whole 'unit' where you put in gas. I haven't.