{"nhtsa_id":635641,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-10-29","date":"2002-09-01","document_id":"ITB02050","mfr_campaign":null,"replaces":null,"component":"UNKNOWN OR OTHER","mfr_system":null,"summary":"SOME VEHICLES MAY EXHIBIT A MALFUNCTION INDICATOR LAMP ON AND EITHER OR BOTH DIAGNOSTIC TROUBLE CODE P0420 / P0430 BANK-1 / BANK-2 CATALYST STORED. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/635641","components":[],"codes":["P0420","P0430"],"topics":[],"vehicles":[{"make":"INFINITI","model":"QX4","year_from":2001,"year_to":2001,"match":"exact","vehicle_ids":["2001_infiniti_qx4"]}],"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":[]}