{"nhtsa_id":10044353,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2012-06-14","date":"2012-05-01","document_id":"SB-49-12","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:ENGINE:DIESEL; FUEL SYSTEM, DIESEL","mfr_system":null,"summary":"WESTERN STAR: AROUND THE DIESEL EXHAUST FLUID (DEF) AN EXCESSIVE AMOUNT OF CRYSTAL OR POWDER BUILT UP INDICATES A LEAK CAUSED BY EVAPORATION OF DEF EXPOSED TO AIR AND/OR DAMPNESS. *PE","document":null,"url":"https://open.wenmarpro.com/bulletins/10044353","components":[{"id":"engine","name":"Engine","parent":null},{"id":"fuel-system","name":"Fuel system","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"WESTERN STAR","model":"4700","year_from":2012,"year_to":2013,"match":"exact","vehicle_ids":["2012_western-star_4700","2013_western-star_4700"]},{"make":"WESTERN 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STAR","model":"4900EX","year_from":2003,"year_to":2004,"match":"base","vehicle_ids":["2003_western-star_4900","2004_western-star_4900"]},{"make":"WESTERN STAR","model":"4900EX","year_from":2006,"year_to":2007,"match":"base","vehicle_ids":["2006_western-star_4900","2007_western-star_4900"]},{"make":"WESTERN STAR","model":"4900FA","year_from":2000,"year_to":2000,"match":"base","vehicle_ids":["2000_western-star_4900"]},{"make":"WESTERN STAR","model":"4900FA","year_from":2003,"year_to":2004,"match":"base","vehicle_ids":["2003_western-star_4900","2004_western-star_4900"]},{"make":"WESTERN STAR","model":"4900SA","year_from":2003,"year_to":2004,"match":"base","vehicle_ids":["2003_western-star_4900","2004_western-star_4900"]},{"make":"WESTERN STAR","model":"5800","year_from":1997,"year_to":2001,"match":"exact","vehicle_ids":["1997_western-star_5800","1998_western-star_5800","1999_western-star_5800","2000_western-star_5800","2001_western-star_5800"]},{"make":"WESTERN STAR","model":"5800","year_from":2002,"year_to":2002,"match":null,"vehicle_ids":[]},{"make":"WESTERN STAR","model":"5900","year_from":null,"year_to":null,"match":"exact","vehicle_ids":[]},{"make":"WESTERN STAR","model":"5900","year_from":1994,"year_to":1994,"match":"exact","vehicle_ids":["1994_western-star_5900"]},{"make":"WESTERN STAR","model":"5900","year_from":1996,"year_to":2003,"match":"exact","vehicle_ids":["1996_western-star_5900","1997_western-star_5900","1998_western-star_5900","1999_western-star_5900","2000_western-star_5900","2001_western-star_5900","2002_western-star_5900","2003_western-star_5900"]},{"make":"WESTERN STAR","model":"5900 HEAVY DUTY","year_from":null,"year_to":null,"match":"base","vehicle_ids":[]},{"make":"WESTERN STAR","model":"5900SS","year_from":null,"year_to":null,"match":"base","vehicle_ids":[]},{"make":"WESTERN STAR","model":"59SS","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"WESTERN STAR","model":"6900","year_from":1994,"year_to":2013,"match":"exact","vehicle_ids":["1994_western-star_6900","1995_western-star_6900","1996_western-star_6900","1997_western-star_6900","1998_western-star_6900","1999_western-star_6900","2000_western-star_6900","2001_western-star_6900","2002_western-star_6900","2003_western-star_6900","2004_western-star_6900","2005_western-star_6900","2006_western-star_6900","2007_western-star_6900","2008_western-star_6900","2009_western-star_6900","2010_western-star_6900","2011_western-star_6900","2012_western-star_6900","2013_western-star_6900"]},{"make":"WESTERN STAR","model":"CONSTELLATION","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"WESTERN STAR","model":"CONSTELLATION","year_from":1995,"year_to":1999,"match":null,"vehicle_ids":[]},{"make":"WESTERN STAR","model":"CONSTELLATION","year_from":2001,"year_to":2001,"match":null,"vehicle_ids":[]},{"make":"WESTERN STAR","model":"CONSTELLATION","year_from":2009,"year_to":2012,"match":null,"vehicle_ids":[]}],"as_of":"2026-10-19","note":"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.","attribution":[]}