# Service bulletin A9421502064418\_2

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: 10203694
- Published by NHTSA: 2021\-12\-07
- Manufacturer's number: A9421502064418\_2
- Manufacturer's date: 2021\-11\-19
- NHTSA component: EXTERIOR LIGHTING:TAIL LIGHTS; EXTERIOR LIGHTING:TURN SIGNAL; ELECTRICAL SYSTEM

## NHTSA's summary

This bulletin states to fill out the questionnaire and clear DTCs if the vehicle is within NVLW for DTC\(s\) B16D4F4, B16D5F4, B16D6F4, B16D7F4, if the vehicle returns then follow additional instructions.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10203694-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10203694-9999.pdf)

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

## Components

Electrical system, Lighting, Tail lights, Turn signals

## Trouble codes named

B16D4, B16D5, B16D6, B16D7

## Vehicles listed

- 2019 to 2020 AUDI A8
- 2021 to 2022 AUDI A8
- 2020 AUDI A8 L E
- 2021 AUDI A8 L E
- 2022 AUDI A8 PHEV

## Other bulletins for the same vehicles and component

- [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.
- [A9023252070332\_1](/bulletins/10236646.md), 2023-06-06, Service bulletin: EXTERIOR LIGHTING:TURN SIGNAL. This bulletin provides information for when the turn signal is unusually loud.
- [A9022872068300\_2](/bulletins/10227832.md), 2023-01-06, Service bulletin: EXTERIOR LIGHTING:TURN SIGNAL. This Pending Service Solution requests that technicians document instances where the clicking sound is unusually loud for the turn signal.
- [A9022792068300\_1](/bulletins/10225532.md), 2022-11-04, Service bulletin: EXTERIOR LIGHTING:TURN SIGNAL. This Pending Service Solution requests that technicians document instances where the clicking sound is unusually loud for the turn signal.
- [A9720702058876\_1](/bulletins/10172767.md), 2020-04-02, Service bulletin: EXTERIOR LIGHTING:TAIL LIGHTS; ELECTRICAL SYSTEM:SOFTWARE. This bulletin contains a software update for the OLED taillights.

JSON: [/v1/bulletins/10203694](/v1/bulletins/10203694)

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