# Service bulletin A9421522065234\_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: 10204963
- Published by NHTSA: 2022\-01\-06
- Manufacturer's number: A9421522065234\_1
- Manufacturer's date: 2021\-12\-07
- NHTSA component: EXTERIOR LIGHTING:TAIL LIGHTS

## NHTSA's summary

This bulletin contains a software update to address various DTCs regarding a tail lamp warning and the warning may flash quicker after actuation.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10204963-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10204963-9999.pdf)

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

## Components

Lighting, Tail lights

## Vehicles listed

- 2020 to 2021 AUDI A4
- 2020 to 2021 AUDI S4

## 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.

JSON: [/v1/bulletins/10204963](/v1/bulletins/10204963)

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