{"vehicle":{"id":"2013_mazda_mazda3","year":2013,"make":"Mazda","model":"Mazda3"},"code":"P0303","generic":true,"description":null,"bulletins":{"as_of":"2026-10-19","count":7,"bulletins":[{"nhtsa_id":10163362,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2019-08-01","date":"2019-07-02","document_id":"01-012-19-3612","mfr_campaign":null,"component":"ENGINE AND ENGINE COOLING","summary":"Some vehicles may experience the Check Engine Light ON with DTC P0300:00, P0301:00, P0302:00, P0303:00 and/or P0304:00 stored in memory. P0300:00: Random misfire detected, P0301:00: Cylinder No.1 misfire detected, P0302:00: Cylinder No.2 misfire detected, P0303:00: Cylinder No.3 misfire detected, P0304:00: Cylinder No.4 misfire detected. Carbon may be deposited around the intake valves, resulting in unstable engine combustion and misfiring during the accelerated warm-up system (AWS) operation.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10163362-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10163362-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10163362"},{"nhtsa_id":10105463,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-06-07","date":"2015-08-18","document_id":"01-020-15-2930","mfr_campaign":null,"component":"ENGINE; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL","summary":"SOME VEHICLES MAY EXPERIENCE THE CHECK ENGINE LIGHT ON WITH DTC P0300:00, P0301:00, P0302:00, P0303:00 AND/OR P0304:00 STORED IN MEMORY. • P0300:00: RANDOM MISFIRE DETECTED • P0301:00: CYLINDER NO.1 MISFIRE DETECTED • P0302:00: CYLINDER NO.2 MISFIRE DETECTED • P0303:00: CYLINDER NO.3 MISFIRE DETECTED • P0304:00: CYLINDER NO.4 MISFIRE DETECTED CARBON MAY BE DEPOSITED AROUND THE INTAKE VALVES, RESULTING IN UNSTABLE ENGINE COMBUSTION AND MISFIRING DURING THE ACCELERATED WARM-UP SYSTEM (AWS) OPERATION.","document":null,"url":"https://open.wenmarpro.com/bulletins/10105463"},{"nhtsa_id":10099813,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-05-19","date":"2015-04-08","document_id":"01-005-15-3030","mfr_campaign":null,"component":"EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL","summary":"SOME VEHICLES MAY EXPERIENCE THE CHECK ENGINE LIGHT ON WITH DTC P0300:00, P0301:00, P0302:00, P0303:00 AND/OR P0304:00 STORED IN MEMORY AND ACCOMPANIED WITH AN INCREASED ENGINE OIL LEVEL. P0300:00: RANDOM MISFIRE DETECTED P0301:00: CYLINDER NO.1 MISFIRE DETECTED P0302:00: CYLINDER NO.2 MISFIRE DETECTED P0303:00: CYLINDER NO.3 MISFIRE DETECTED P0304:00: CYLINDER NO.4 MISFIRE DETECTED THIS IS CAUSED BY IMPROPER CONTROL LOGIC OF THE PCM. IN COLD WEATHER BELOW 14 °F (-10 °C) WITH REPEATED SHORT TIME OPERATION, EXCESS FUEL INJECTED IN THE CYLINDERS MAY ACCUMULATE IN THE CRANK CASE AND RESULT IN INCREASED OIL LEVEL AND MISFIRE.","document":null,"url":"https://open.wenmarpro.com/bulletins/10099813"},{"nhtsa_id":10099730,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-05-19","date":"2014-12-12","document_id":"01-019-14-2985","mfr_campaign":null,"component":"EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL","summary":"SOME VEHICLES MAY EXPERIENCE THE CHECK ENGINE LIGHT ON WITH DTC P0300:00, P0301:00, P0302:00, P0303:00 AND/OR P0304:00 STORED IN MEMORY AND ACCOMPANIED WITH AN INCREASED ENGINE OIL LEVEL.P0300:00: RANDOM MISFIRE DETECTED P0301:00: CYLINDER NO.1 MISFIRE DETECTED P0302:00: CYLINDER NO.2 MISFIRE DETECTED P0303:00: CYLINDER NO.3 MISFIRE DETECTED P0304:00: CYLINDER NO.4 MISFIRE DETECTEDTHIS IS CAUSED BY IMPROPER CONTROL LOGIC OF THE PCM. IN COLD WEATHER BELOW 14 °F (-10 °C) WITH REPEATED SHORT TIME OPERATION, EXCESS FUEL INJECTED IN THE CYLINDERS MAY ACCUMULATE IN THE CRANK CASE AND RESULT IN INCREASED OIL LEVEL AND MISFIRE.","document":null,"url":"https://open.wenmarpro.com/bulletins/10099730"},{"nhtsa_id":10099235,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-05-16","date":"2015-06-19","document_id":"01-005-15-3030A","mfr_campaign":null,"component":"EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ENGINE","summary":"SOME VEHICLES MAY EXPERIENCE THE CHECK ENGINE LIGHT ON WITH DTC P0300:00, P0301:00, P0302:00, P0303:00 AND/OR P0304:00 STORED IN MEMORY AND ACCOMPANIED WITH AN INCREASED ENGINE OIL LEVEL. P0300:00: RANDOM MISFIRE DETECTED P0301:00: CYLINDER NO.1 MISFIRE DETECTED P0302:00: CYLINDER NO.2 MISFIRE DETECTED P0303:00: CYLINDER NO.3 MISFIRE DETECTED P0304:00: CYLINDER NO.4 MISFIRE DETECTED THIS IS CAUSED BY IMPROPER CONTROL LOGIC OF THE PCM. IN COLD WEATHER BELOW 14 °F (-10 °C) WITH REPEATED SHORT TIME OPERATION, EXCESS FUEL INJECTED IN THE CYLINDERS MAY ACCUMULATE IN THE CRANK CASE AND RESULT IN INCREASED OIL LEVEL AND MISFIRE.","document":null,"url":"https://open.wenmarpro.com/bulletins/10099235"},{"nhtsa_id":10092781,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-02-24","date":"2016-06-10","document_id":"01-014-16-3208","mfr_campaign":null,"component":"ELECTRICAL SYSTEM:IGNITION","summary":"SOME VEHICLES MAY EXPERIENCE A LACK OF ENGINE POWER/ROUGH IDLING AND THE CHECK ENGINE LIGHT ON WITH ONE OR MORE OF THE MISFIRE RELATED DTCS OF P0300:00, P0301:00, P0302:00, P0303:00 AND P0304:00. THIS CONCERN MAY BE CAUSED BY AN INTERNAL FAILURE OF THE IGNITION COIL(S) DUE TO A HIGH DIFFERENCE BETWEEN COLD AND WARM AMBIENT TEMPERATURES. THE PRODUCTION METHOD OF THE IGNITION COIL HAS BEEN CHANGED TO ELIMINATE THIS CONCERN.","document":null,"url":"https://open.wenmarpro.com/bulletins/10092781"},{"nhtsa_id":10092026,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-02-16","date":"2016-06-10","document_id":"01-014-16-3208","mfr_campaign":null,"component":"ENGINE","summary":"SOME VEHICLES MAY EXPERIENCE A LACK OF ENGINE POWER/ROUGH IDLING AND THE CHECK ENGINE LIGHT ON WITH ONE OR MORE OF THE MISFIRE RELATED DTCS OF P0300:00, P0301:00, P0302:00, P0303:00 AND P0304:00. THIS CONCERN MAY BE CAUSED BY AN INTERNAL FAILURE OF THE IGNITION COIL(S) DUE TO A HIGH DIFFERENCE BETWEEN COLD AND WARM AMBIENT TEMPERATURES. THE PRODUCTION METHOD OF THE IGNITION COIL HAS BEEN CHANGED TO ELIMINATE THIS CONCERN.","document":null,"url":"https://open.wenmarpro.com/bulletins/10092026"}],"url":"https://open.wenmarpro.com/makes/mazda/mazda3/2013/bulletins?code=P0303"},"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/mazda3/2013/codes/P0303","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."]}