{"vehicle":{"id":"2021_honda_civic-type-r","year":2021,"make":"Honda","model":"Civic Type R"},"code":"P0304","generic":true,"description":null,"bulletins":{"as_of":"2026-10-19","count":6,"bulletins":[{"nhtsa_id":11024893,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-11-04","date":"2025-10-13","document_id":"A25-062","mfr_campaign":null,"component":"ENGINE","summary":"Service Bulletin - Water could enter the hood scoop and accumulate down inside the no. 4 spark plug hole. This can corrode the ignition coil, plug tube, and spark plug, leading to a misfire to the no. 4 cylinder. If a misfire is detected, DTC P0304 is stored.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11024893-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11024893-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11024893"},{"nhtsa_id":11022041,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-08-21","date":"2025-08-19","document_id":"A25-062","mfr_campaign":null,"component":"ENGINE","summary":"Service Bulletin - Water could enter the hood scoop and accumulate down inside the no. 4 spark plug hole. This can corrode the ignition coil, plug tube, and spark plug, leading to a misfire to the no. 4 cylinder. If a misfire is detected, DTC P0304 is stored.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11022041-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11022041-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11022041"},{"nhtsa_id":10242562,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2023-09-21","date":"2023-09-14","document_id":"ATI&09142023901","mfr_campaign":null,"component":"ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM","summary":"Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2021 Civic Type R with a customer complaint of the vehicle Malfunction Indicator Light (MIL) with DTC P0300 (Random Misfire Detected) and/or P0304 (No. 4 Cylinder Misfire Detected) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10242562-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10242562-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10242562"},{"nhtsa_id":10241868,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2023-09-06","date":"2023-08-29","document_id":"ATI&08292023904","mfr_campaign":null,"component":"ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING","summary":"Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2021 Civic Type R with a customer complaint of the vehicle Malfunction Indicator Light (MIL) with DTC P0300 (Random Misfire Detected) and/or P0304 (No. 4 Cylinder Misfire Detected) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10241868-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10241868-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10241868"},{"nhtsa_id":10240765,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2023-08-18","date":"2023-08-14","document_id":"ATI&08142023901","mfr_campaign":null,"component":"ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING","summary":"Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2021 Civic Type R with a customer complaint of the vehicle Malfunction Indicator Light (MIL) with DTC P0300 (Random Misfire Detected) and/or P0304 (No. 4 Cylinder Misfire Detected) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10240765-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10240765-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10240765"},{"nhtsa_id":10240328,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2023-08-03","date":"2023-07-28","document_id":"ATI&07282023903","mfr_campaign":null,"component":"ENGINE AND ENGINE COOLING","summary":"Dealer Message -American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2021 Civic Type R with a customer complaint of the vehicle Malfunction Indicator Light (MIL) with DTC P0300 (Random Misfire Detected) and/or P0304 (No. 4 Cylinder Misfire Detected) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10240328-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10240328-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10240328"}],"url":"https://open.wenmarpro.com/makes/honda/civic-type-r/2021/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-type-r/2021/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."]}