{"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,"replaces":null,"component":"UNKNOWN OR OTHER","mfr_system":null,"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","components":[],"codes":["P0420","P0430"],"topics":[],"vehicles":[{"make":"MAZDA","model":"MILLENIA","year_from":1997,"year_to":2000,"match":"exact","vehicle_ids":["1997_mazda_millenia","1998_mazda_millenia","1999_mazda_millenia","2000_mazda_millenia"]}],"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":[]}