Service bulletins for the 2021 Audi S5
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
994 on file from NHTSA, as of 2026-10-19.
About U1421 on the 2021 Audi S5: what the code means, and the bulletins and recalls about the same components.
By type
By component
By trouble code
Only bulletins with trouble code: U1421 are shown. Show all
| A9124782075537_2 | 2024-12-04. Service bulletin. ELECTRICAL SYSTEM. This TSB provides information when DTCs U142100 and U164200 are stored as passive/sporadic in the gateway. |
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| A9124632075537_1 | 2024-11-06. Service bulletin. ELECTRICAL SYSTEM. This TSB provides information when DTCs U142100 and U164200 are stored as passive/sporadic in the gateway. |
| A9022732052299_5 | 2022-07-01. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin contains repair instructions for proper transport mode deactivation (DTC U142100, DTC P169A00, and U13EB00 ). |
| A9022462052299_4 | 2022-03-04. Service bulletin. EQUIPMENT. This bulletin contains repair instructions for proper transport mode deactivation (DTC U142100, DTC P169A00, and U13EB00 ). |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.