{"nhtsa_id":630855,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-04-24","date":"2002-03-21","document_id":"NTB02033","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM:IGNITION:MODULE","mfr_system":null,"summary":"VEHICLES MAY EXPERIENCE DIAGNOSTIC TROUBLE CODE 1491, 1998-2002 ALL MODELS. *SLC","document":null,"url":"https://open.wenmarpro.com/bulletins/630855","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"ignition","name":"Ignition","parent":"electrical"}],"codes":[],"topics":[],"vehicles":[{"make":"NISSAN","model":"NISSAN","year_from":null,"year_to":null,"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":[]}