My 325ci has had the p0411 code for a while now and I'm trying to fix it. I already checked to make sure that the pump is blowing air on cold starts. I just cleaned the secondary MAF and the connectors and the secondary air filter looks fine. All the hoses are in good shape so my problem must be the check valve, right? Is there any way to test it? Could there be any other problems?
p0411 Trouble!
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