# P0491 on the 2012 Audi Q7

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P0491

- [10123886](https://open.wenmarpro.com/bulletins/10123886), 2017-11-17: MIL on. DTC P0491 and P0492 \(Secondary Air System Insufficient Flow, Bank 1/2\) are stored at the same time. Mileage is greater than 15,000 miles. Under certain driving conditions, the secondary air ports in the cylinder head can accumulate carbon over time, causing a restriction.
- [10119937](https://open.wenmarpro.com/bulletins/10119937), 2017-10-21: The MIL is on due to DTCs P0491 and P0492 being stored in the ECM.