Diagnostic Guide: P0300 — Random/Multiple Cylinder Misfire Detected OBD-II
Quick Answer
What P0300 Means
Your engine has random misfires across multiple cylinders. The engine isn't burning fuel properly in one or more cylinders.
Most Likely Cause
Worn spark plugs or ignition coils
This is the cause in approximately 50-60% of cases
Spark plug replacement is one of the easiest DIY repairs. Most people can do this.
Driving with misfires can damage your catalytic converter. Fix as soon as possible.
Driving Not Recommended
Driving with misfires can damage your catalytic converter. Fix as soon as possible.
$100 - $400
At a repair shop
$20 - $100
DIY (parts only)
Parts You May Need
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Detailed Diagnostic Information
Important Disclaimer
This information is for educational purposes only. We are not licensed mechanics. Always consult a certified mechanic for diagnosis and repair. Improper repairs can be dangerous.
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Last updated: 2025-11-26