OBD2 Codes

P0300 – Random Misfire Detected

Multiple cylinders misfiring; can be spark plugs coils or fuel delivery.

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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

Quick checklist

Check spark plugs for wear test ignition coils verify fuel pressure

FAQ

Common questions

Should I replace all spark plugs at once?

Yes—replace in sets to maintain consistent ignition across cylinders.