P0301High urgency
Cylinder 1 Misfire Detected
Powertrain · Ignition System
⛔ Drive cautiously — prolonged misfire damages catalytic converter.
What this means
Cylinder 1 is not firing properly. Unlike P0300 (random misfires), this code is isolated to a single cylinder, making diagnosis more straightforward. The misfire may feel like a rhythmic shake at idle or under acceleration.
Likely causes
- Faulty spark plug in cylinder 1Most common
- Bad ignition coil on cylinder 1Most common
- Clogged fuel injector on cylinder 1Common
- Low compression in cylinder 1Less common
Estimated repair cost
Spark plug replacement$30 – $100
Ignition coil replacement$80 – $250
Fuel injector replacement$150 – $400
🏪
Sponsored · Local Shop
Find shops near you specializing in this repair
Get quotes from certified mechanics · Free estimates
📦
Sponsored · Parts
Top-rated parts for this repair
Direct-fit · Same-day shipping · 4.7★ average rating
Frequently asked questions
What does P0301 mean?
Cylinder 1 is not firing properly. Unlike P0300 (random misfires), this code is isolated to a single cylinder, making diagnosis more straightforward. The misfire may feel like a rhythmic shake at idle or under acceleration.
Is P0301 serious?
Drive cautiously — prolonged misfire damages catalytic converter.
How much does it cost to fix P0301?
Repair costs for P0301 range from $30 – $100 depending on the root cause and your vehicle.
Can I drive with P0301?
No — this code indicates a serious issue. Stop driving and have the vehicle inspected immediately.