U1421 on the 2022 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.
This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.
| A9124782075537_2 | 2024-12-04. Service bulletin. 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. This TSB provides information when DTCs U142100 and U164200 are stored as passive/sporadic in the gateway. |
| A9022732052299_5 | 2022-07-01. Service bulletin. This bulletin contains repair instructions for proper transport mode deactivation (DTC U142100, DTC P169A00, and U13EB00 ). |
| A9022462052299_4 | 2022-03-04. Service bulletin. This bulletin contains repair instructions for proper transport mode deactivation (DTC U142100, DTC P169A00, and U13EB00 ). |
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.