{"nhtsa_id":10010314,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2004-11-15","date":"2004-07-19","document_id":"02804","mfr_campaign":null,"replaces":"02804R","component":"ENGINE AND ENGINE COOLING:ENGINE","mfr_system":null,"summary":"MALFUNCTION INDICATOR LAMP ON WITH DIAGNOSTIC TROUBLE CODE P0420. *TT UPDATE. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10010314","components":[{"id":"engine","name":"Engine","parent":null}],"codes":["P0420"],"topics":[],"vehicles":[{"make":"TOYOTA","model":"COROLLA","year_from":2003,"year_to":2004,"match":"exact","vehicle_ids":["2003_toyota_corolla","2004_toyota_corolla"]}],"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":[]}