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Can someone explain this to me my Instagram is core126.
It flashes when I’m driving and when I stop either it’s on or not
 

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2004 Trailblazer LS 4x4, 4.2L:, 2016 ATS-V, 2014 CTS-V Wagon, 2018 Audi A7
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Start with going to any parts store and having them read your codes. Or a dealer, but I would shy away from that.
 
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