Error code
Infiniti All models code P0491
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Meaning
Secondary air injection insufficient, Bank 1. The secondary air pump is operating but not injecting adequate airflow. Causes include a clogged air injection port, a stuck combination valve, or a partially failed pump. Often appears alongside P0412
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Address of this page: https://www.remfixit.com/tr/infiniti/tum-modeller/p0491