WenmarOpen by Wenmar Pro

Service bulletin 521-14

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 id10141900
Published by NHTSA2018-06-18
Manufacturer's number521-14
Manufacturer's date2014-05-21
NHTSA componentENGINE AND ENGINE COOLING:EXHAUST SYSTEM; FUEL SYSTEM, DIESEL

NHTSA's summary

521-14 FMI 0: Under Pressurized Diesel Exhaust Fluid (DEF) System

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, Exhaust and emissions, Fuel system

Vehicles listed
FCCC FCCC
FREIGHTLINER FREIGHTLINER
WESTERN STAR WESTERN STAR

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