DTC code
P0304
Cylinder 4 Misfire Detected
Technical guide
Symptoms
- Cylinder 4 misfire
- rough idle
- check engine light
Probable causes
- Cylinder 4 misfire
- ignition coil
- spark plug
- injector
- compression
Diagnostic steps
- Swap coil.
- Replace spark plug.
- Test injector.
- Compression test.
Cross-checked technical synthesis (QA). It does not replace the manufacturer's procedure.
Models most reported with this code (NHTSA)
Ford Escape 43Ford Edge 25Honda Accord 18Honda Odyssey 18Ford Fusion 16Honda CR-V 15Honda Pilot 12Kia Sorento 9
Count of distinct owner complaints mentioning the code. US data — same engines, same failures.
AI here is a librarian: this page shows only what mechanics confirmed, or says “unknown”. It never suggests a diagnosis — MECCANIC interprets the code, never your car.
0 confirmed cases on P0304
Nothing confirmed yet for this code. No guess is offered on purpose.
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