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International Automotive Technicians Network
Re: 2014 Impala with a P0411 and clogged SAIR passageways
Posted to Technical Discussion Forum on 4/25/2018 1 Reply

GM TSB 17-NA-080 addresses this. It states "This condition may be caused by a by-product of using inferior fuel, creating restriction in the SAI ports in the cylinder head causing higher than expected SAI operation pressure."

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