P1204 Error Code on Acura: Causes, Diagnosis, and Solutions
The OBD-II code P1204 on an Acura vehicle indicates a fuel supply problem or a misfire in cylinder number 4. This failure can be caused by various factors, including an ignition issue, a faulty injector, or a vacuum leak.
Possible Causes of the P1204 Code on Acura
- Failure of the ignition spark
- Problem with the primary or secondary ignition
- Malfunction of the fuel supply system
- Insufficient fuel pressure or faulty injector
- Vacuum leak that may disrupt the air-fuel mixture
- Engine mechanical problem affecting combustion
How to Fix the P1204 Code on an Acura?
1. Ignition System Inspection
- Check the condition of cylinder 4’s spark plug (fouling, cracks, wear).
- Test the ignition coil by swapping it with another and observe if the problem moves.
- Inspect electrical wires and connectors for broken wires, corroded pins, or loose connections.
2. Fuel Supply System Check
- Measure fuel pressure at the injection rail.
- Test the cylinder 4 injector (electrical resistance, proper mechanical operation).
- Clean or replace the injector if necessary.
3. Vacuum Leak Detection
- Inspect vacuum hoses and the intake manifold for cracks or leaks.
- A smoke test can be useful to detect leaks not visible to the naked eye.
4. Engine Mechanical Condition Check
- Perform a compression test to ensure cylinder 4 is functioning properly.
- Ensure the timing is correctly set and that no valves are damaged.
5. Wiring Harness Inspection
- Examine the wiring connected to the injector and coil of cylinder 4.
- Check wire continuity using a multimeter.
6. Code Clearing and Road Test
Once repairs are completed, use an OBD-II diagnostic tool to clear the P1204 code. Then, perform a road test to confirm the issue is resolved.
Symptoms of the P1204 Code on Acura
- Illumination of the check engine light on the dashboard
- Engine power loss
- Rough idle or hesitation during acceleration
- Increased fuel consumption
Meaning of the P1204 Code
The P1204 code generally indicates a fuel system failure related to a misfire in cylinder 4. However, the description may vary depending on the specific Acura model and year.
If the problem persists after these checks, it is advisable to consult a specialist or an Acura dealership for further diagnosis.