2007 Chevy Impala obd code

2007 CHEVROLET IMPALA
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DERF13MD
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Engine Mechanical problem
2007 Chevy Impala 6 cyl Two Wheel Drive Automatic

I have a code 449, and think its my gas cap, what else could it be?
Jan 12, 2010 at 8:16 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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