Hummer H3 P Codes (Powertrain) P0400 - P0499

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2007 Hummer H3 Code Issue

2007 HUMMER H3
2007 Hummer H-3 Code Issue Unable To Clear Code Po411 Reads Secondary Air Inadequate Upward Flow #1.replaced Valve Then Reset Code Code Then...
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Asked by David C Cantatore

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