{"vehicle":{"id":"2003_honda_accord","year":2003,"make":"Honda","model":"Accord"},"code":"P0420","generic":true,"description":null,"bulletins":{"as_of":"2026-10-19","count":3,"bulletins":[{"nhtsa_id":10014203,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2005-04-29","date":"2003-12-16","document_id":"1203","mfr_campaign":null,"component":"ENGINE AND ENGINE COOLING:ENGINE","summary":"DIAGNOSTIC TROUBLE CODE P0420 AND/OR P0430, CATALYST EFFICIENCY (V6). *NM","document":null,"url":"https://open.wenmarpro.com/bulletins/10014203"},{"nhtsa_id":10014141,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2005-04-28","date":"2004-06-16","document_id":"604","mfr_campaign":null,"component":"ENGINE AND ENGINE COOLING:ENGINE","summary":"UPDATE ECM/PCM FOR DIAGNOSTIC TROUBLE CODE P0420, CATALYST BELOW THRESHOLD. *NM","document":null,"url":"https://open.wenmarpro.com/bulletins/10014141"},{"nhtsa_id":10004706,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2004-01-02","date":"2004-09-23","document_id":"03063","mfr_campaign":null,"component":"ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR","summary":"MALFUNCTION INDICATOR LAMP COMES ON WITH DIAGNOSTIC TROUBLE CODE (DTC) P0420. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10004706"}],"url":"https://open.wenmarpro.com/makes/honda/accord/2003/bulletins?code=P0420"},"related":{"components":[],"bulletins":[],"recalls":{"may_apply":true,"recalls":[],"lookup":{"nhtsa":"https://www.nhtsa.gov/recalls","tc":"https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng","maker":null}}},"url":"https://open.wenmarpro.com/makes/honda/accord/2003/codes/P0420","note":"The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.","attribution":["Contains information licensed under the Open Government Licence – Canada."]}