{"vehicle":{"id":"2004_toyota_corolla","year":2004,"make":"Toyota","model":"Corolla"},"code":"P0420","generic":true,"description":null,"bulletins":{"as_of":"2026-10-19","count":1,"bulletins":[{"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,"component":"ENGINE AND ENGINE COOLING:ENGINE","summary":"MALFUNCTION INDICATOR LAMP ON WITH DIAGNOSTIC TROUBLE CODE P0420. *TT UPDATE. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10010314"}],"url":"https://open.wenmarpro.com/makes/toyota/corolla/2004/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/toyota/corolla/2004/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."]}