P0300 code: random or multiple cylinder misfire

Code P0300 means the vehicle has detected misfires affecting one or more engine cylinders without identifying a single specific cylinder.

Symptoms of P0300

• Engine shaking or vibration
• Loss of power
• Increased fuel consumption
• Unburned fuel odor
• Check Engine light on

Common causes

• Worn or faulty spark plugs
• Damaged ignition coils
• Dirty fuel injectors
• Vacuum leaks
• Fuel-system problems

How to diagnose P0300

An OBD-II scanner that can display live engine data can help with diagnosis. Further inspection is needed to identify the actual cause.

View the complete technical page for P0300

Is it dangerous to drive with P0300?

Misfires can damage the catalytic converter if they are ignored. Diagnose the fault as soon as possible, especially if the Check Engine light is flashing or the engine is running poorly.