Service bulletin Circular21H2REV1

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.

NHTSA's summary

Due to a parts catalog error, incorrect emissions related component(s) may have been installed on some vehicles during a past service repair visit. Dealers will inspect and, if needed, replace the component(s) as a proactive measure to ensure continued emissions compliance. REVISED: Removed the need for particle sensor plug on Touareg SCR Catalysts

The document

• NHTSA's copy of the document (PDF)
• If that address does not open, try this one

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine

Listing a model year does not mean every vehicle of it is concerned: the document says which.

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