{"nhtsa_id":11033838,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-06-16","date":"2026-06-03","document_id":"26-FL-002H TSB","mfr_campaign":null,"replaces":null,"component":"FUEL/PROPULSION SYSTEM","mfr_system":null,"summary":"Some Sonata Hybrid (DN8 HEV) vehicles may display a Check Engine light and store one or more of the DTCs listed below due to an abnormal air-fuel ratio in a specific cylinder. This bulletin provides instructions to update the Engine Control Module (ECM) to resolve the air-fuel ratio logic.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11033838-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11033838-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11033838","components":[{"id":"fuel-system","name":"Fuel system","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"HYUNDAI","model":"SONATA HYBRID","year_from":2024,"year_to":2026,"match":"base","vehicle_ids":["2024_hyundai_sonata","2025_hyundai_sonata","2026_hyundai_sonata"]}],"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":[]}