{"nhtsa_id":627998,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-03-01","date":"2001-10-16","document_id":"161001","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR","mfr_system":null,"summary":"BRIEF INFORMATION ON VEHICLES EXHIBITING DIAGNOSTIC TROUBLE CODE P0420 CATALYST SYSTEM LOW EFFICIENCY BANK ONE. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/627998","components":[{"id":"engine","name":"Engine","parent":null},{"id":"exhaust-emissions","name":"Exhaust and emissions","parent":null},{"id":"catalytic-converter","name":"Catalytic converter","parent":"exhaust-emissions"}],"codes":["P0420"],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"ASTRO","year_from":1999,"year_to":1999,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"SAFARI","year_from":1999,"year_to":1999,"match":"exact","vehicle_ids":["1999_gmc_safari"]}],"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":[]}