# P0491 on the 2011 Audi A4

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

- [10212656](https://open.wenmarpro.com/bulletins/10212656), 2022-05-31: MIL on. DTC P0491 and P0492 \(Secondary Air System Insufficient Flow, Bank 1/2\) are stored at the same time.
- [10210604](https://open.wenmarpro.com/bulletins/10210604), 2022-05-02: DTC P0491 and P0492 \(Secondary Air System Insufficient Flow, Bank 1/2\) are stored at the same time.