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2011 dash issue

T. Dozier

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Buick Ownership
Lacrosse
My entire dash started to blink on and off. I took to dealer but they couldn’t duplicate issue. I got it back and of course it started again but then the right side started to vibrate and car said I was going 131 mph and limit my speed. I immediately took it back to dealer and they said they haven’t been able to duplicate butter dis get a catalytic converged code. Has anyone else had similar issues?
 
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