check engine light comes on- 2000 buick park avenue

2000 BUICK PARK AVENUE
85,000 MILES
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PAPACHALIE
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check engine light comes on had it checked and the tech. turned the light off and since come back on. Had this problen before and replaced the gas cap and it solved the problem (25000 miles ago). any ideas?
Feb 7, 2012 at 7:49 PM
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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