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2020 Mazda CX-9 Signature 2.5L Poor Idle Quality, Misfire
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...
Summary posted 5/31/2026
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Related Documents & Media | VIN | JM3TCBEY1L |
| Engine | 2.5 L / 4 cyl / GAS |
| Trans | 6-speed Automatic (Electronic) |
| Delivery | Fuel Injection / direct |
| Emissions | OBD-II Compliant |
| Symptoms | Poor Idle Quality, Misfire |
| Occurs | Hot, Idle |
| Misc. | Po300 |
Trouble Codes
| P0300 | Multiple Misfire Detected |
Message Closed w/Summary
Vehicle Data
2020 Mazda CX-9 Signature
| VIN | JM3TCBEY1L |
| Engine | 2.5 L / 4 cyl / GAS |
| Trans | 6-speed Automatic (Electronic) |
| Delivery | Fuel Injection / direct |
| Emissions | OBD-II Compliant |
| Symptoms | Poor Idle Quality, Misfire |
| Occurs | Hot, Idle |
| Misc. | Po300 |
Trouble Codes
| P0300 | Multiple Misfire Detected |
Video