# Service bulletin A9421422063973\_1

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.

- Type: Service bulletin
- NHTSA id: 10199220
- Published by NHTSA: 2021\-08\-04
- Manufacturer's number: A9421422063973\_1
- Manufacturer's date: 2021\-07\-14
- NHTSA component: EXTERIOR LIGHTING:TAIL LIGHTS; ELECTRICAL SYSTEM:SOFTWARE

## NHTSA's summary

This bulletin contains a software update for a tail light warning with DTCs B16D431, B16D531, B16D631, and/or B16D731.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10199220-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10199220-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Lighting, Software, Tail lights

## Trouble codes named

B16D4, B16D5, B16D6, B16D7

## Vehicles listed

- 2020 AUDI E\-TRON
- 2021 AUDI E\-TRON

## Other bulletins for the same vehicles and component

- [A0023822047812\_7](/bulletins/10248111.md), 2024-01-04, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. This bulletin provides information on how to set up and use the SD Creator for obtaining vehicle software updates via the Mirror Server.
- [A9123542067843\_3](/bulletins/10247504.md), 2024-01-04, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. This bulletin provides information when the configuration appears without apparent reason with MIB3.
- [A9123432071056\_2](/bulletins/10245536.md), 2023-12-06, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:INFOTAINMENT. This bulletin provides information for when Outlook contacts are not accessible via the MMI when using Apple devices with MIB3.
- [A9423672071954\_1](/bulletins/10244595.md), 2023-11-06, Service bulletin: EXTERIOR LIGHTING:TAIL LIGHTS; EXTERIOR LIGHTING:HEADLIGHTS. This bulletin provides information pertaining to when there are foreign objects inside of a headlight or taillight.
- [A9123072064681\_3](/bulletins/10238289.md), 2023-07-10, Service bulletin: EQUIPMENT:ELECTRICAL:INFOTAINMENT; EQUIPMENT:ELECTRICAL:INFOTAINMENT:SOFTWARE; ELECTRICAL SYSTEM:SOFTWARE. This bulletin provides information for when wireless charging with the Audi Phone Box does not work.
- [A9123952067843\_2](/bulletins/10237002.md), 2023-06-06, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. This bulletin provides instructions to disable the configuration wizard.
- [A5723032062887\_3](/bulletins/10233546.md), 2023-04-06, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. This bulletin provides instructions for when key adaptation fails with error messages "FAZ1552E Key status not valid" and "FAZ1540E Action not successful" when performing the vehicle immobilizer adaptation test plan.
- [A4822362067555\_2](/bulletins/10227810.md), 2023-01-06, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. This bulletin provides a software update for DTC B200049 with Symptom Code 7353984.
- [A4822332064018\_6](/bulletins/10214741.md), 2022-07-01, Service bulletin: UNKNOWN OR OTHER; ELECTRICAL SYSTEM:SOFTWARE. This bulletin contains a software update to address a red steering warning light with DTC C10AC07 stored.
- [A4622332051095\_7](/bulletins/10214737.md), 2022-07-01, Service bulletin: UNKNOWN OR OTHER; ELECTRICAL SYSTEM:SOFTWARE. This informational bulletin contains instructions on how to download and use the Audi Frequency App.

JSON: [/v1/bulletins/10199220](/v1/bulletins/10199220)

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