P0456 on the 2023 Audi S4
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.
| TSB_2078916_3 | 2026-07-07. Service bulletin. This bulletin provides information when the fuel tank cap seal is leaking; DTC P044200, P045600 and/ or P00EF00 in stored in the ECM. |
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| TSB_2078916_2 | 2025-11-08. Service bulletin. This bulletin provides information when the fuel tank cap seal is leaking; DTC P044200, P045600 and/ or P00EF00 in stored in the ECM. |
| TSB_2078916_1 | 2025-09-04. Service bulletin. This TSB provides information when the fuel tank cap seal is leaking, DTC P044200, P045600, and/or P00EF00 stored in ECM. |
| A0124412071199_4 | 2024-11-06. Service bulletin. This bulletin provides information when the MIL is on P045600 Very Small Leak Detected - NVLD. |
| A0124122071199_3 | 2024-04-04. Service bulletin. This bulletin provides information when the MIL is illuminated, P045600 Very Small Leak detected - NVLD. |
| A0123692071199_2 | 2023-09-01. Service bulletin. This bulletin provides information for when the MIL is on and P045600 is stored. |
| A0123662071199_1 | 2023-09-01. Service bulletin. This bulletin provides information for when the MIL is on with DTC P045600 Very Small Leak detected NVLD. |
7 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.