What does code P0303 mean?
Cylinder 3 is experiencing continuous misfires
OBD-II Code
P0303 — Cylinder 3 Misfire Detected
Cylinder 3 is experiencing continuous misfires
Common symptoms
- Hesitation
- unstable idle
- flashing check engine light
Possible causes
- Faulty ignition coil
- worn spark plug
- clogged injector
- low compression
Initial recommendation
Check ignition spark, fuel injection and compression.
Safety notice
This information is for guidance only and does not replace a physical vehicle inspection or diagnosis by a qualified mechanic. If the vehicle has severe power loss, smoke, a fuel odor, overheating, brake or steering problems, or any unsafe behavior, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine code P0303 with your vehicle's actual symptoms for more complete diagnostic guidance.
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