P0300
System
Powertrain (Engine)
Scanner som krävs
Basic OBD2 code reader (engine codes, live data, smog readiness)

Random/Multiple Cylinder Misfire Detected

Understand P0300, common causes, and the right FOXWELL scanner to diagnose it.

The ECU detected misfires in more than one cylinder or could not isolate the misfire to a single cylinder. This often causes rough idle, hesitation, and a flashing check engine light.

Vanliga symptom

  • Rough idle
  • Loss of power under acceleration
  • Engine vibration
  • Flashing MIL (stop driving if flashing)

Typiska orsaker

  • Worn spark plugs or ignition coils
  • Vacuum leak
  • Low fuel pressure
  • Clogged fuel injectors
  • Low compression in one or more cylinders

Vilken scanner behöver du?

Basic OBD2 code reader (engine codes, live data, smog readiness)

Använd live-data och freeze frame innan du byter delar. ABS-, SRS- och U-koder kräver oftast en fullsystems-scanner.

Diagnostiktips

  • Spara freeze frame när koden först sätts
  • Rensa koden först efter att orsaken är åtgärdad
  • Kontrollera relaterade väntande koder
  • Verifiera batterispänning över 12,4 V innan du misstänker sensorer

Rekommenderade FOXWELL-scannrar

Vanliga frågor

Can I diagnose P0300 with a basic code reader?
Yes — P0300 is typically accessible with a basic OBD2 code reader like the FOXWELL NT201 or NT301. Live data helps confirm the repair.
Is it safe to drive with P0300?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.