{"nhtsa_id":10199099,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-07-09","date":"2021-06-22","document_id":"21-01-051H","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"This bulletin provides information related to an Electronic Control Module (ECM) software update which revises the OBD Air Fuel Ratio Imbalance (AFRI) monitor function frequency and cylinder imbalance diagnosis logic.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10199099-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10199099-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10199099","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"HYUNDAI","model":"SONATA","year_from":2020,"year_to":2021,"match":"exact","vehicle_ids":["2020_hyundai_sonata","2021_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":[]}