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P0420 2004 Nissan Altima Sedan -my manifold id's cracked can that be the problem?

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The manifold has a crack next to the welding, were the 4pipes connect. Can that be the problem for code P0420.

Vehicle: 2004 nissan altima, 2.5S

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Yes, definitely the manifold leak will cause the P0420 code.

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