{"vehicle":{"id":"1999_mazda_millenia","year":1999,"make":"Mazda","model":"Millenia"},"code":"P0420","generic":true,"description":null,"bulletins":{"as_of":"2026-10-19","count":1,"bulletins":[{"nhtsa_id":620007,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2001-07-09","date":"2001-02-28","document_id":"0100301","mfr_campaign":null,"component":"UNKNOWN OR OTHER","summary":"SOME VEHICLES MAY EXHIBIT MALFUNCTION INDICATOR LAMP ILLUMINATION WITH DIAGNOSTIC TROUBLE CODE (DTC) P0420 / 0421 OR P0430 / 0431 STORED IN MEMORY WITH NO DRIVEABILITY CONCERNS PRESENT. THIS CONDITION MAY BE CAUSED BY AN OVERLY SENSITIVE REAR OXYGEN SENSOR(S), WHICH FASELY INDICATES AN EMISSIONS CONCERN AND A DTC TO BE STORED. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/620007"}],"url":"https://open.wenmarpro.com/makes/mazda/millenia/1999/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/mazda/millenia/1999/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."]}