{"vehicle":{"id":"2022_honda_civic-si","year":2022,"make":"Honda","model":"CIVIC SI"},"code":"P0304","generic":true,"description":null,"bulletins":{"as_of":"2026-10-19","count":2,"bulletins":[{"nhtsa_id":11037696,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-10-01","date":"2026-09-25","document_id":"A26-010","mfr_campaign":null,"component":"ENGINE","summary":"Service Bulletin - Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience overheating, coolant loss, and/or misfire. In some cases, DTCs P0300 through P0304 may also be stored (DTCs are not required for repair).","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11037696-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11037696-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11037696"},{"nhtsa_id":11036409,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-08-27","date":"2026-08-26","document_id":"A26-010","mfr_campaign":null,"component":"ENGINE","summary":"Service Bulletin - Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience overheating, coolant loss, misfire and/or DTCs P0300 thru P0304 stored.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11036409-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11036409-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11036409"}],"url":"https://open.wenmarpro.com/makes/honda/civic-si/2022/bulletins?code=P0304"},"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/honda/civic-si/2022/codes/P0304","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."]}