Cylinder 1 Misfire Detected
What it means
Cylinder 1 specifically is misfiring — combustion there is incomplete or absent.
Symptoms
Rough running, vibration, power loss, possibly a flashing check-engine light.
Common causes
Bad spark plug or coil on cylinder 1, faulty injector, low compression, or a wiring fault.
Recommended action
Swap the coil/plug with a neighbouring cylinder to see if the misfire follows. Fix promptly to protect the catalyst.
Related codes
FAQ — P0301
What does code P0301 mean?
Cylinder 1 Misfire Detected. Cylinder 1 specifically is misfiring — combustion there is incomplete or absent.
What are the symptoms of P0301?
Rough running, vibration, power loss, possibly a flashing check-engine light.
What causes P0301?
Bad spark plug or coil on cylinder 1, faulty injector, low compression, or a wiring fault.
What should I do about P0301?
Swap the coil/plug with a neighbouring cylinder to see if the misfire follows. Fix promptly to protect the catalyst.
General reference based on the SAE J2012 standard. Exact causes for your vehicle may differ — when in doubt, consult a workshop.
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