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2005 Chevrolet Trailblazer Question: Why is check engine light on my '05 trailblazer?

 

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JPman, 4.2L 6 Cylinder, Waterloo, IA, July 31, 2014, 06:00
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After analyzing, diagnostic codes are b0055, b0040, b0201, and p0128, what are they?

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