P0491
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Secondary air injection system insufficient flow (bank 1)
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Though the secondary air injection system is operating, the secondary airflow to the exhaust port is too small.
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- Harness or connectors
(Air cut solenoid valve circuit is open or shorted) (Air cut solenoid valve relay circuit is open or shorted)
- Air cut solenoid valve
- Air cut solenoid valve relay
- Disconnection, clogging, collapsing and damage of hose or piping
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