That's not going to cause a secondary air flow code.
And replacing the hose under the intake will only fix your problem if the hose is cracked or broken. What's more likely is the secondary air passages in the heads are clogged. That's going to require pulling the heads off and drilling out the passages. Basically a partial engine rebuild. That's why everyone recommends staying away from the 545, 645, and 745. Just not worth the hassle.
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ASE and BMW Master Certified Technician
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