{"nhtsa_id":636597,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-11-10","date":"2002-05-03","document_id":"050302","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:EXHAUST SYSTEM","mfr_system":null,"summary":"IN SEVERE POLICE VEHICLE USE SITUATIONS THE FRONT EXHAUST O-RING STYLE HANGER MAY BECOME DISCONNECTED AND EVENTUALLY FALL OFF. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/636597","components":[{"id":"engine","name":"Engine","parent":null},{"id":"exhaust-emissions","name":"Exhaust and emissions","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"IMPALA","year_from":2001,"year_to":2002,"match":"exact","vehicle_ids":["2001_chevrolet_impala","2002_chevrolet_impala"]}],"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":[]}