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P0404 P0405 Chevy Equinox EGR Valve Check Engine Light - YouTube
Equinox egr p0404 Chevy equinox p0411: secondary air injection system → incorrect flow
Chevy Equinox P0411: Secondary Air Injection System → Incorrect Flow
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P0404 P0405 Chevy Equinox EGR Valve Check Engine Light - YouTube