Free DTC page
P0304: Cylinder 4 Misfire Detected
The PCM detected repeated combustion misses on cylinder 4.
Common causes
- Cylinder 4 coil or plug
- Injector issue
- Oil or coolant fouling
- Compression fault
This free page explains the code. A Shop Brief adapts the next steps to your year, make, model, and full code stack.
Related codes:
P0300P0302P0303 Pricing Sample brief