P0300 Diagnostic Trouble Code Discussion for May 2026
Multiple Misfire Detected
Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.Trouble Ticket Help Requests for DTC P0300
| Help Request | Posted | |
| 2020 Mazda CX-9 Signature 2.5L Poor Idle Quality, Misfire VIN: JM3TCBEY1L P0300: occasional miss on all mostly 2 and 3. came from another shop mass air flow was not reading egr was sticking. replaced mass air removed egr and cleaned. just unplugged for time being pricey little fellow. Now runs good off idle ,soon as sets and idles for a couple of minutes starts back missing... |
May 23, 2026 | |
| 2012 Jeep Wrangler Unlimited Sahara 3.6L Misfire VIN: 1C4HJWEG3C P0300: Random misfire. ... adaptive. Relearn crank/cam and idle. On the third key cycle / long drive, cylinder one misfire starts to count up to 200 plus. Sometimes cylinder 3 and 5 will have some misfire counts too. The engine shows very slight misfire, not noticeable until ho... |
May 29, 2026 | |
| 2020 Mazda CX-9 Signature 2.5L Poor Idle Quality, Misfire VIN: JM3TCBEY1L P0300: occasional miss on all mostly 2 and 3. came from another shop mass air flow was not reading egr was sticking. replaced mass air removed egr and cleaned. just unplugged for time being pricey little fellow. Now runs good off idle ,soon as sets and idles for a couple of minutes starts back missing... |
May 29, 2026 | |
| 2018 Nissan Kicks S 1.6L Poor Idle Quality VIN: 3N1CP5CU6J P0300: Random misfire. There is only 4.7 volts on the power wire (red) at Mass Air Flow Sensor plugged in. MAF ground wire confirmed good. 12 Volts should be supplied be the ECM. There is only 4.7 Volts coming out of ECM at connector. Substituted a used computer with same result... |
May 29, 2026 |
