# Service bulletin 26 12 15 2026528

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: 10212656
- Published by NHTSA: 2022\-05\-31
- Manufacturer's number: 26 12 15 2026528
- Manufacturer's date: 2012\-11\-05
- NHTSA component: ELECTRICAL SYSTEM; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:AIR HANDLER/CHAMBER, DUCTS, AND VALVES

## NHTSA's summary

MIL on. DTC P0491 and P0492 \(Secondary Air System Insufficient Flow, Bank 1/2\) are stored at the same time.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2012/MC-10212656-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2012/MC-10212656-9999.pdf)

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

## Components

Electrical system, Glass, wipers and mirrors, Heating and air conditioning

## Trouble codes named

P0491, P0492

## Vehicles listed

- 2010 to 2011 AUDI A4
- 2009 to 2011 AUDI A6
- 2009 to 2011 AUDI Q5

## Recalls for the same vehicles and component

- [17V001000](/recalls/nhtsa/17V001000.md), 2017-01-03: AIR BAGS:SIDE/WINDOW; VISIBILITY:SUN/MOON ROOF ASSEMBLY

## Other bulletins for the same vehicles and component

- [TSB\_20741717\_15](/bulletins/11036915.md), 2026-09-04, Service bulletin: VISIBILITY/WIPER. This bulletin provides information on the GFF test plan required for AC compressor replacements regardless of the concern.
- [TSB\_2059335\_7](/bulletins/11034643.md), 2026-07-07, Service bulletin: ELECTRICAL SYSTEM. This bulletin provides information when there are noises from the area around the instrument cluster.
- [TSB\_2074729\_3](/bulletins/11034634.md), 2026-07-07, Service bulletin: ELECTRICAL SYSTEM. This bulletin provides informationwhen noises/vibration are detected from front of vehicle in dynamic mode.
- [TSB\_2081405\_1](/bulletins/11031051.md), 2026-04-07, Service bulletin: ELECTRICAL SYSTEM. This bulletin provides informaiotn about various infortainment system complaints.
- [TSB\_2024323\_13](/bulletins/11030985.md), 2026-04-07, Service bulletin: ELECTRICAL SYSTEM. This bulletin provides information when the parking assistance gives false warnings.
- [TSB\_2024323\_12](/bulletins/11030984.md), 2026-04-07, Service bulletin: ELECTRICAL SYSTEM. This bulletin provides information when the parking assistance gives false warnings.
- [TSB\_2059335\_6](/bulletins/11029370.md), 2026-03-03, Service bulletin: ELECTRICAL SYSTEM. This TSB provides information when there are noises from the area around the instrument cluster.
- [TSB\_2080681\_1](/bulletins/11028448.md), 2026-02-06, Service bulletin: ELECTRICAL SYSTEM. This bulletin provides information regarding contact checks for event memories, intermittent.
- [TSB\_2080329\_1](/bulletins/11028446.md), 2026-02-06, Service bulletin: ELECTRICAL SYSTEM. This bulletin provides informaiotn when there are noises from the headliner.
- [TSB\_2056019\_5](/bulletins/11028397.md), 2026-02-06, Service bulletin: ELECTRICAL SYSTEM. This bulletin provides information when the anti\-theft alarm activates for no reason, or does not activate.

JSON: [/v1/bulletins/10212656](/v1/bulletins/10212656)

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