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P0304 — Cylinder 4 Misfire Detected

Cylinder 4 is misfiring.

Severity: HighRepair: $20-$800Difficulty: Easy

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Common symptoms of P0304

Common causes of P0304

Repair cost & difficulty

Typical cost to fix P0304: $20-$800 · Difficulty: Easy

Pro tip: On I4 engines, cylinder 4 coil wiring may be damaged by heat from firewall proximity.

Vehicles commonly affected

All makes

Related trouble codes

P0300P0204

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ScanFixAI is a diagnostic aid, not a substitute for professional repair. Cost estimates are typical ranges and vary by vehicle and region.