Quick checklist
Check spark plugs for wear test ignition coils verify fuel pressure
OBD2 Codes
P0300 – Random Misfire Detected
Multiple cylinders misfiring; can be spark plugs coils or fuel delivery.
Details
Random misfire across cylinders. Check spark plugs coils and fuel quality before replacing expensive sensors.
Typical causesWorn spark plugs bad ignition coils low fuel pressure contaminated fuel
SymptomsRough idle loss of power check engine light flashing
SeverityHigh — can damage catalytic converter if ignored
DIY checksCheck spark plugs for wear test ignition coils verify fuel pressure
ToolsSpark plug tester coil tester fuel pressure gauge
Utilities
Copy-paste helpers
Browse More
Explore OBD2 Codes
View all 391 obd2 codes codes
FAQ
Common questions
Should I replace all spark plugs at once?
Yes—replace in sets to maintain consistent ignition across cylinders.
Community
Discussion & Experiences
Share your experience, solutions, or ask questions about this error code. Help others troubleshoot!
Loading comments...