{"vehicle":{"id":"2018_mazda_mazda3","year":2018,"make":"Mazda","model":"Mazda3"},"code":"P0300","generic":true,"description":null,"bulletins":{"as_of":"2026-10-19","count":2,"bulletins":[{"nhtsa_id":10153314,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2019-02-19","date":"2019-01-24","document_id":"01-007-19-3541","mfr_campaign":null,"component":"ENGINE","summary":"When the engine is started for the first time after parking the vehicle overnight in cold conditions (below 32 degrees Fahrenheit / 0 degrees Celsius), some vehicles may exhibit a rough idle and/or the check engine light on with any of the following DTC(s) stored in memory. P0300 - Random misfire detected P0301 - Cylinder No. 1 misfire detected P0302 - Cylinder No. 2 misfire detected P0303 - Cylinder No. 3 misfire detected P0304 - Cylinder No.4 misfire detected. This may be caused by frozen water accumulated in the main silencer, restricting exhaust flow.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10153314-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10153314-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10153314"},{"nhtsa_id":10134691,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2018-04-23","date":"2018-03-09","document_id":"01-006-18-3429","mfr_campaign":null,"component":"ENGINE; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM","summary":"When the engine is started for the first time after parking the vehicle overnight in cold conditions (below 32 degrees Fahrenheit / 0 degrees Celsius), some vehicles may exhibit a rough idle and/or the check engine light on with any of the following DTC(s) stored in memory. P0300 - Random misfire detected P0301 - Cylinder No.1 misfire detected P0302 - Cylinder No.2 misfire detected P0303 - Cylinder No.3 misfire detected P0304 - Cylinder No.4 misfire detected. This may be caused by frozen water accumulated in the main silencer, restricting exhaust flow.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2018/MC-10134691-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2018/MC-10134691-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10134691"}],"url":"https://open.wenmarpro.com/makes/mazda/mazda3/2018/bulletins?code=P0300"},"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/mazda/mazda3/2018/codes/P0300","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."]}