U1642 on the 2019 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.
| A9123702062973_4 | 2023-03-06. Service bulletin. This bulletin provides information for when an SOS malfunction is displayed in the instrument cluster; DTCs U142100, U164200, and/or U122C00. |
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| A9122442062973_3 | 2022-12-06. Service bulletin. This bulletin states that an SOS malfunction accompanied by DTCs U142100, U164200, and/or U122C100 my be stored erroneously and the ETCs should be cleared. |
| A9122332062973_2 | 2022-10-05. Service bulletin. This bulletin states that an SOS malfunction accompanied by DTCs U142100, U164200, and/or U122C100 my be stored erroneously and the ETCs should be cleared. |
| A9121912062973_1 | 2021-05-06. Service bulletin. This bulletin contains instructions for when DTC U142100, U164200, and/or U122C00 are stored in the Gateway module with an SOS malfunction message in the instrument cluster. |
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.