P0301 Error Code
📋 What Does P0301 Mean?
Cylinder 1 misfire detected — cylinder 1 is not firing consistently.
🔍 Common Causes
- 1Failed ignition coil on cylinder 1
- 2Worn spark plug on cylinder 1
- 3Clogged fuel injector on cylinder 1
- 4Low compression in cylinder 1
📞 When to Call a Pro
If swapping coil does not move the misfire, injector or compression testing needed.
🔧 DIY Fix Steps
- 1Swap the coil from cylinder 1 to another cylinder and rescan — if misfire code moves, coil is bad
- 2Inspect and replace the spark plug on cylinder 1
- 3Add fuel injector cleaner to tank
Frequently Asked Questions
What does P0301 mean on a Bmw vehicle?
Cylinder 1 misfire detected — cylinder 1 is not firing consistently.
Can I fix P0301 myself?
Yes, in many cases. Start with: swap the coil from cylinder 1 to another cylinder and rescan — if misfire code moves, coil is bad If that does not resolve it, if swapping coil does not move the misfire, injector or compression testing needed.
How much does it cost to repair error P0301?
Estimated repair cost: $50–$500. This varies by region and technician.
Tools That Help With This Diagnosis
Basic troubleshooting tools grouped separately from the actual error-code explanation.
Multimeters
Useful for basic electrical checks when the repair path calls for it and the unit is safely isolated.
Driver sets
Useful when the first obstacle is simply reaching the part or hose involved.
Cleanup tools
Useful for drain and leak faults where standing water hides the problem.
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