P0491 on the 2012 Audi A8
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.
| 0112652030230 | 2024-02-20. Service bulletin. MIL on, A8 4.2 FSI, P0491 or P0492 secondary air system bank 1/2 Insufficient flow - Repair Authorization |
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| A011710 2035002- | 2018-02-05. Service bulletin. This bulletin contains diagnosis and repair information for DTC P049100 and P049200. |
2 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.