U1421 on the 2019 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.
This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.
| TSB_2056076_22 | 2025-04-04. Service bulletin. This bulletin provides information when there is an SOS Malfunction with ConBox Low, "Emergency call function: fault", (DTC U142100, U153E00). |
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| A9124522056076_21 | 2024-10-28. Service bulletin. This bulletin provides information when there is an SOS Malfunction with ConBox Low, "Emergency call function: fault", (DTC U142100, U153E00). |
| A9124482070942_4 | 2024-09-06. Service bulletin. This bulletin provides information when there is an SOS Malfunction warning in the instrument cluster in vehicles with ConBox Low; DTC U142100 stored in the gateway. |
| A9124482070942_4 | 2024-09-06. Service bulletin. This bulletin provides information when there is an SOS Malfunction warning in the instrument cluster in vehicles with ConBox Low; DTC U142100 stored in the gateway. |
| A9124052070942_3 | 2024-05-06. Service bulletin. This bulletin provides information when there is no diagnostic communication to the control module (ConBox), DTC U142100. |
5 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.