# Service bulletin Circular 26P2

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: 10204966
- Published by NHTSA: 2022\-01\-06
- Manufacturer's number: Circular 26P2
- Manufacturer's date: 2021\-12\-14
- NHTSA component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL

## NHTSA's summary

A small number of vehicles were manufactured with incorrect catalytic converters. This issue does not have any impact on vehicle tailpipe emissions. To ensure continued emissions compliance, Audi will proactively inspect and replace the catalytic converters on affected vehicles.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10204966-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10204966-9999.pdf)

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

## Components

Engine, Exhaust and emissions

## Vehicles listed

- 2019 AUDI A8
- 2019 AUDI Q8

## Recalls for the same vehicles and component

- [21V111000](/recalls/nhtsa/21V111000.md), 2021-02-24: ENGINE; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\)

## Other bulletins for the same vehicles and component

- [TSB\_2081030\_4](/bulletins/11038090.md), 2026-10-05, Service bulletin: ENGINE. This bulletin provides information when there is an abnormal knocking noise from the engine compartment; V6 3.0L TFSI.
- [TSB\_2081030\_3](/bulletins/11036938.md), 2026-09-04, Service bulletin: ENGINE. This bulletin provides information when there is an abnormal engine knocking noise from the engine compartment; V6 3.0L TFSI.
- [TSB\_2079209\_3](/bulletins/11036931.md), 2026-09-04, Service bulletin: ENGINE. This bulletin provides information when the exhuast emissions warning lamp is on P0299.
- [SM 34\-2026](/bulletins/11036900.md), 2026-09-04, Other: ENGINE. This special notice is to inform dealers to return the parts listed and only order the successor parts going forward.
- [TSB\_2082323\_1](/bulletins/11034728.md), 2026-07-07, Service bulletin: ENGINE. This bulletin provides informaiton when the engine is not running smoothly, misfiring.
- [TSB\_2081573\_2](/bulletins/11034699.md), 2026-07-07, Service bulletin: ENGINE. This bulletin provides informatio when fuel pump/ sender, fuel tank level implausible, DTC B105A1A B103E29 Stored in 0017.
- [TSB\_2074640\_3](/bulletins/11034657.md), 2026-07-07, Service bulletin: ENGINE. This bulletin provides information when there is increased oil consumption; \>0.5ltr/1000 km.
- [TSB\_2073867\_3](/bulletins/11034656.md), 2026-07-07, Service bulletin: ENGINE. This bulletin provides information when DTC U140A00 Terminal 30 is stored in the ECM.
- [TSB\_2072473\_3](/bulletins/11034653.md), 2026-07-07, Service bulletin: ENGINE. This bulletin provides informaiotn when the red coolant warning lamp comes on or coolang leak at turbocharger.
- [TSB\_2081030\_2](/bulletins/11032174.md), 2026-05-05, Service bulletin: ENGINE. This bulletin provides information when there is an abnormal engine knocking noise from the engine compartment; V6 3.0L TFSI.

JSON: [/v1/bulletins/10204966](/v1/bulletins/10204966)

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