{"nhtsa_id":10168123,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2019-11-21","date":"2019-11-20","document_id":"OLFL821-Emission","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING; EQUIPMENT","mfr_system":null,"summary":"Owner's Letter for emissions recall FL821 for Western Star 4900 exhaust pipes emitting excess pollutants. Pipe support brackets lacks durability and may cause pipe to crack at bellows and weld breaks to occur at the flange.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10168123-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10168123-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10168123","components":[{"id":"engine","name":"Engine","parent":null},{"id":"equipment","name":"Equipment and accessories","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"WESTERN STAR","model":"4900","year_from":2016,"year_to":2019,"match":"exact","vehicle_ids":["2016_western-star_4900","2017_western-star_4900","2018_western-star_4900","2019_western-star_4900"]}],"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":[]}