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engine light on 1999 GMC Sonoma

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
engin light is on. engine runs rough at idle, auto zone can not read the computer, why cant they get any info from it
(1) Answer
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check the cigarette lighter fuse,its integrated with your diagnostic link connecter.if its blown it wont communicate with a scan tool.