2002 GMC Sonoma SERVICE LIGHT CAME ON

2002 GMC SONOMA
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DENNISD4OK
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Engine Performance problem
2002 GMC Sonoma 6 cyl Two Wheel Drive Automatic

Where do I place the connection to the truck to read the code for what is wrong and why it needs service?
Sep 28, 2009 at 4:54 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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