P0303 on the 2013 Mazda Mazda3
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.
Nobody has written a description of this code yet.
| 01-012-19-3612 | 2019-08-01. Service bulletin. 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. |
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| 01-020-15-2930 | 2017-06-07. Service bulletin. 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. |
| 01-005-15-3030 | 2017-05-19. Service bulletin. 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. |
| 01-019-14-2985 | 2017-05-19. Service bulletin. 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. |
| 01-005-15-3030A | 2017-05-16. Service bulletin. 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. |
| 01-014-16-3208 | 2017-02-24. Service bulletin. 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. |
| 01-014-16-3208 | 2017-02-16. Service bulletin. 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. |
7 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.