P0301

Cylinder 1 Misfire Detected

Severity: High Ignition System Generic OBD-II Code Est. Repair: $80 - $350

High severity. Avoid long drives and get diagnosed as soon as possible. Flashing check engine light = stop driving if safe.

What Does P0301 Mean?

Misfire specifically in cylinder 1. Continued driving can overheat and destroy the catalytic converter.

Common Symptoms

CEL
Rough running
Possible raw-fuel smell
Vibration

Possible Causes

Bad spark plug or coil on cyl 1
Clogged/leaking injector
Low compression
Wiring issue
Vacuum leak near cyl 1

How to Fix P0301 – Repair Guide

Swap coil with another cylinder and retest
Replace plug
Check injector pulse
Compression or leak-down test if ignition/fuel OK
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Recommended OBD2 Scanners & Tools

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Disclaimer: Information is for educational reference only and does not replace professional diagnosis. Actual causes and costs vary by vehicle make, model, year and condition. Always verify with a qualified technician.