OBD-II code guide
P0204 Injector Circuit Cylinder 4
P0204 means the fuel injector circuit for cylinder 4 has an electrical fault.
What it means
Cylinder 4 injector control may be missing, shorted, or out of range.
Common symptoms
- Rough idle
- Misfire
- Poor power
- Check engine light
- Possible fuel smell
Likely causes
- Failed injector
- Open circuit
- Shorted wiring
- Poor connector
- Control module driver fault
First checks
- Check for P0304 at the same time.
- Inspect wiring near the injector.
- Confirm power and control before replacing the injector.
- Treat flashing check engine light as urgent.