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Service bulletin 420

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10009767
Published by NHTSA2004-10-21
Manufacturer's number420
Manufacturer's date2004-09-24
NHTSA componentVISIBILITY:POWER WINDOW DEVICES AND CONTROLS

NHTSA's summary

REAR WINDOW UNLOCKING BUTTON OF REAR WINDOW MAY NOT FUNCTION. *TC

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Glass, wipers and mirrors, Power windows

Vehicles listed
PORSCHE CAYENNE2004
PORSCHE CAYENNE S2003, 2004 (the catalog's model; the bulletin names a series or trim of it)
PORSCHE CAYENNE TURBO2003, 2004 (the catalog's model; the bulletin names a series or trim of it)

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