P0301 (generic)
Cylinder 1 Misfire Detected
System: Powertrain · Ignition / Misfire
Severity: severe · Inspection: often fails
Description
Cylinder 1 is misfiring. Swap the coil/plug with another cylinder; if the misfire follows, replace that component. Otherwise investigate injector and compression.
Diagnostic snapshot P0301
- Difficulty
- 6/10 — Intermediate diagnostics
- Est. repair cost
- $120 – $450 (parts + typical shop labor)
Diagnostic workflow
- Confirm P0301 with a live scan — note pending vs stored and freeze frame data.
- Inspect wiring/connectors and related sensors before replacing modules.
- Clear codes and road-test; re-scan after two drive cycles if the monitor must set.
Topics
- OBD-II and scan tools (guide)
- Powertrain DTCs (P-prefix) (system)
Related symptoms
None linked yet.
Common fixes (curated)
None linked yet.
Related articles
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Diagnostic bundle (JSON)
Machine-readable graph: related codes, symptoms, fixes, topics, articles, and curated sources rows. Append &external=1 for optional YouTube / Google CSE hits when API keys are configured (see web/.env.example).