P0300 – Random/Multiple Cylinder Misfire Detected

Description

Engine is misfiring in multiple cylinders without a consistent pattern. Check the conditions around the fault with freeze-frame data and compare related values using OBD2 live data.

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Symptoms

Rough idle
Hesitation
Poor acceleration
Engine shaking
Check engine light

Causes

Worn spark plugs
Faulty ignition coils
Vacuum leaks
Fuel injector issues
Low fuel pressure

Diagnosis

Check misfire counters
Inspect spark plugs
Test ignition coils
Check fuel trims
Perform smoke test

Repair

Replace spark plugs
Replace faulty coils
Fix vacuum leaks
Clean or replace injectors
Check fuel pressure