P0301 — Cylinder 1 Misfire Detected
Category: Powertrain Severity: High
Updated:
DTC code P0301 means: Cylinder 1 Misfire Detected. It falls under the "Powertrain" category, with an estimated severity of High. Common causes include faulty spark plug or coil (cylinder 1), faulty fuel injector (cylinder 1) and vacuum leak; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Faulty spark plug or coil (cylinder 1)
- Faulty fuel injector (cylinder 1)
- Vacuum leak
- Low compression (cylinder 1)
Symptoms
- Engine vibration
- Loss of power
- Higher fuel consumption
- Engine may not start
How to diagnose it step by step
- Swap the cylinder 1 coil with another cylinder.
- Clear codes and test: if the misfire moves, replace the coil.
- If it doesn't move, swap the spark plug.
- If it stays on cylinder 1, check the injector and compression.
How to fix it
Check spark plugs, coils and position sensors (crankshaft/camshaft); replace any faulty part.
Estimated repair cost
Spark plug: $10–40. Coil: $60–220. Injector: $100–400.
Frequently asked questions
What does DTC code P0301 mean?
Cylinder 1 Misfire Detected.
Is code P0301 serious?
Severity High. Have it checked as soon as possible, especially if it affects safety or the catalytic converter.
Can I keep driving with code P0301?
Avoid it if the light is flashing; with a steady light, only as needed.
Related codes
P0300 P0302 P0303 P0304 P0305 P0306 P0307 P0308 P0316 P0320
Refine by car make
- Audi P0301: Cylinder 1 individual coil pack.
- BMW P0301: Cylinder 1 coil/spark plug; rule out a vacuum leak.
- Citroën P0301: Spark plugs, coils, or position sensor.
- Dacia P0301: Spark plugs or coils.
- Fiat P0301: Spark plugs or coils.
- Ford P0301: Cylinder 1 coil or spark plug.
- Honda P0301: Spark plugs, coils, or position sensor.
- Hyundai P0301: Coils or spark plugs.
- Kia P0301: Coils or spark plugs.
- Mazda P0301: Coils or spark plugs.
- Mercedes-Benz P0301: Spark plugs, coils, or position sensor.
- Nissan P0301: Coils, spark plugs, or position sensor.
- Opel P0301: Cylinder 1 coil or spark plug.
- Peugeot P0301: Cylinder 1 spark plug, coil, or injector.
- Renault P0301: Cylinder 1 spark plug, coil, or injector.
- Toyota P0301: Cylinder 1 spark plug, coil, or injector.
- Volkswagen P0301: Cylinder 1 individual coil pack.
- Volvo P0301: Coils or spark plugs.
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