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Service bulletin WMJ4

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 id10200926
Published by NHTSA2021-09-03
Manufacturer's numberWMJ4
Manufacturer's date2021-08-11
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

Porsche intranet posting with information on Workshop campaign WMJ4 - Performing concluding work for AMA4 Stop Delivery.

The document

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

Vehicles listed
PORSCHE 718 SPYDER2021
PORSCHE redundant BOXSTER2021
PORSCHE redundant CAYMAN2021

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