{"nhtsa_id":10204250,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-12-09","date":"2021-11-08","document_id":"21-EM-010H-1","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"Certain 2020-2021 Sonata (DN8a) vehicles with 1.6T engines may exhibit a check engine light in conjunction with a popping noise, abnormal smell from the engine compartment, rough running, or reduced power due to a misfire.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10204250-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10204250-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10204250","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":[]}