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P0456 on the 2021 Audi A4 allroad

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 P0456
A0124412071199_42024-11-06. Service bulletin. This bulletin provides information when the MIL is on P045600 Very Small Leak Detected - NVLD.
A0124122071199_32024-04-04. Service bulletin. This bulletin provides information when the MIL is illuminated, P045600 Very Small Leak detected - NVLD.
A0123692071199_22023-09-01. Service bulletin. This bulletin provides information for when the MIL is on and P045600 is stored.
A0123662071199_12023-09-01. Service bulletin. This bulletin provides information for when the MIL is on with DTC P045600 Very Small Leak detected NVLD.

4 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.