{"nhtsa_id":10244906,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2023-11-06","date":"2023-10-09","document_id":"09-110-23","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING; EQUIPMENT; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR","mfr_system":null,"summary":"This Service Information Bulletin announces diagnostic service procedures to be followed when DTC P0420 (Catalyst System Efficiency Below Threshold Bank 1) is detected by the Engine Control Module (ECM). If DTC P0420 is found to be stored in the ECM, follow the diagnostic procedures outlined below.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10244906-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10244906-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10244906","components":[{"id":"engine","name":"Engine","parent":null},{"id":"equipment","name":"Equipment and accessories","parent":null},{"id":"exhaust-emissions","name":"Exhaust and emissions","parent":null},{"id":"catalytic-converter","name":"Catalytic converter","parent":"exhaust-emissions"}],"codes":["P0420"],"topics":[],"vehicles":[{"make":"SUBARU","model":"ASCENT","year_from":2019,"year_to":2021,"match":"exact","vehicle_ids":["2019_subaru_ascent","2020_subaru_ascent","2021_subaru_ascent"]},{"make":"SUBARU","model":"CROSSTREK","year_from":2017,"year_to":2023,"match":"exact","vehicle_ids":["2017_subaru_crosstrek","2018_subaru_crosstrek","2019_subaru_crosstrek","2020_subaru_crosstrek","2021_subaru_crosstrek","2022_subaru_crosstrek","2023_subaru_crosstrek"]},{"make":"SUBARU","model":"FORESTER","year_from":2017,"year_to":2023,"match":"exact","vehicle_ids":["2017_subaru_forester","2018_subaru_forester","2019_subaru_forester","2020_subaru_forester","2021_subaru_forester","2022_subaru_forester","2023_subaru_forester"]},{"make":"SUBARU","model":"IMPREZA","year_from":2017,"year_to":2023,"match":"exact","vehicle_ids":["2017_subaru_impreza","2018_subaru_impreza","2019_subaru_impreza","2020_subaru_impreza","2021_subaru_impreza","2022_subaru_impreza","2023_subaru_impreza"]},{"make":"SUBARU","model":"LEGACY","year_from":2017,"year_to":2023,"match":"exact","vehicle_ids":["2017_subaru_legacy","2018_subaru_legacy","2019_subaru_legacy","2020_subaru_legacy","2021_subaru_legacy","2022_subaru_legacy","2023_subaru_legacy"]},{"make":"SUBARU","model":"OUTBACK","year_from":2017,"year_to":2023,"match":"exact","vehicle_ids":["2017_subaru_outback","2018_subaru_outback","2019_subaru_outback","2020_subaru_outback","2021_subaru_outback","2022_subaru_outback","2023_subaru_outback"]}],"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":[]}