P0301: Cylinder 1 Misfire Detected
174 vehicles · 27 makes
P0301 is an OBD-II diagnostic trouble code meaning “Cylinder 1 Misfire Detected.” Misfires detected specifically in cylinder 1. Unlike P0300, a single-cylinder code narrows the problem to that cylinder's ignition, fuel, or compression. This code appears across 174 vehicle models from 27 manufacturers.
Common Causes
Diagnostic Tools
To diagnose P0301, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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Vehicles Affected (174)
FAQ
What does P0301 mean?
P0301 stands for "Cylinder 1 Misfire Detected." Misfires detected specifically in cylinder 1. Unlike P0300, a single-cylinder code narrows the problem to that cylinder's ignition, fuel, or compression.
What are the most common causes of P0301?
The most common causes of P0301 are: Failed ignition coil on cylinder 1, Worn spark plug, Clogged or leaking fuel injector, Low compression (worn rings or valve issue), Vacuum leak near cylinder 1. The specific cause varies by vehicle.
How much does it cost to fix P0301?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P0301?
Au7o has documented P0301 across 174 vehicle models from 27 manufacturers: Acura, Audi, BMW, Cadillac, Chevrolet, Chrysler, Citroën, Dodge, Ford, GMC, Honda, Hyundai, Jaguar, Jeep, Kia, Land Rover, Lexus, MINI, Mazda, Nissan, Porsche, RAM, Renault, Subaru, Toyota, Volkswagen, Volvo.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.