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Codes P0491 and P0492 on a BMW 745Li indicate issues with the secondary air injection system. Specifically, P0491 refers to insufficient flow in the secondary air system during startup, while P0492 indicates excessive flow. These codes often point to problems with the air pump, valves, or related hoses, and can lead to increased emissions if not addressed. It's advisable to diagnose and repair the system to ensure proper vehicle performance and compliance with emissions standards.
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