{"vehicle":{"id":"2019_dodge_challenger","year":2019,"make":"Dodge","model":"Challenger"},"code":"P0420","generic":true,"description":null,"bulletins":{"as_of":"2026-10-19","count":2,"bulletins":[{"nhtsa_id":11012186,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-01-03","date":"2024-12-19","document_id":"18-090-24","mfr_campaign":null,"component":"POWER TRAIN","summary":"\"Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● **P0420 - Catalyst System Efficiency Below Threshold Bank 1. ● P0430 - Catalyst System Efficiency Below Threshold Bank 2.** ● P0456 - EVAP System Small Leak. NOTE: If DTC P0456 is present use the wiTECH Small Leak Verification test (SLVT) to determine if a leak is present in the system. This bulletin involves reprogramming the PCM with the latest available software.\"","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2024/MC-11012186-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2024/MC-11012186-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11012186"},{"nhtsa_id":10187697,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-03-01","date":"2020-12-10","document_id":"18-106-20","mfr_campaign":null,"component":"ENGINE; EQUIPMENT; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ELECTRICAL SYSTEM","summary":"Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes (DTCs):P0420 - Catalyst System Efficiency Below Threshold Bank 1 P0430 - Catalyst System Efficiency Below Threshold Bank 2. Customers may also describe the following: Hearing a pre-detonation noise (Spark Knock) sound in the engine during acceleration.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10187697-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10187697-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10187697"}],"url":"https://open.wenmarpro.com/makes/dodge/challenger/2019/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/dodge/challenger/2019/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."]}