OBD code P0304 indicates a misfire in cylinder 4 of the engine.
This code affects the ignition system.
Symptoms include the engine light being on, lack of power, hard starting, and engine hesitation.
Common causes are a faulty spark plug, clogged fuel injector, or ignition coil issues.
While not an immediate emergency, it can lead to further damage if ignored.
A possible fix involves checking and potentially replacing the spark plug, fuel injector, or ignition coil for cylinder 4, as well as inspecting related wiring and connectors for any damage.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
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Symptoms of the p0304 OBD Code
The vehicle may experience rough idling or a noticeable lack of power under load.
- With OBD code P0304, the engine light will be ON.
- Lack/loss of power may be experienced.
- Hard start can occur.
- Engine hesitation might be noticeable.
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Causes of the p0304 OBD Code
P0304 code typically indicates a misfire in cylinder 4 of the engine.
- P0304 can be caused by: Faulty Spark Plug #4.
- Clogged or faulty Fuel Injector #4.
- Faulty Ignition Coil #4.
- Fuel Injector #4 harness is open or shorted.
- Fuel Injector #4 circuit poor electrical connection.
- Ignition Coil #4 harness is open or shorted.
- Ignition Coil #4 circuit poor electrical connection.
- Insufficient cylinder 4 compression.
- Incorrect fuel pressure.
- Intake air leak.
Fixing Error Code p0304 Step By Step
Addressing fault code P0304 involves diagnosing and resolving cylinder 4 misfire issues in the engine.
- To fix OBDII code P0304, first, review the possible causes related to cylinder 4 misfire.
- Visually inspect the spark plug, ignition coil, and fuel injector for any signs of damage or wear.
- Check the wiring harness and connectors associated with cylinder 4 for any issues.
- Ensure the connector pins are not broken, bent, pushed out, or corroded.
- Test the compression in cylinder 4 to rule out any internal engine problems.
- Swap the ignition coil with another cylinder to see if the misfire follows.
- Replace the spark plug, ignition coil, or fuel injector if necessary.
- Clear the fault code with a scan tool and test drive the vehicle to verify the repair.
Cost Of Fixing p0304 Fault Code
Diagnosing and repairing fault code P0304 typically involves addressing cylinder 4 misfire issues.
The cost to diagnose and fix OBD code P0304 typically ranges from $75 to $150, with an estimated repair time of 1. 0 hour.
Costs depend on labor rates, shop fees, and the complexity of the repair needed.
Details of the p0304 OBD Code
Fault code P0304 indicates a misfire in cylinder 4 of the engine.
Code P0304 means a misfire was detected in cylinder 4. It’s triggered by the Engine Control Module (ECM) based on crankshaft speed fluctuations.
This code indicates that there was a misfire in the fourth cylinder of the engine, which can be caused by issues such as a faulty spark plug, ignition coil, fuel injector, vacuum leak, or low compression in that cylinder.
The ECM monitors the crankshaft speed to detect any variations caused by misfires in specific cylinders, in this case, cylinder 4.
Mechanic’s Tech Notes
Code P0304 indicates a misfire in cylinder 4, potentially caused by ignition system faults or fuel delivery issues.
To diagnose and fix OBDII code P0304 (Cylinder 4 Misfire Detected), start by checking the ignition system components like spark plugs, ignition coils, and spark plug wires for any faults.
Use a voltmeter to test the resistance of the ignition coil and ensure it’s within specifications.
Perform a compression test on cylinder 4 to check for any internal engine issues.
Inspect the fuel injector for proper operation and ensure it’s receiving power and ground.
A scan tool can help monitor live data to pinpoint the misfire cause.
Clear the code after repairs and test drive to confirm the issue is resolved.
FAQ
Common causes of OBD code P0304: Faulty Spark Plug #4, Clogged Fuel Injector #4, Faulty Ignition Coil #4, Poor electrical connections, Insufficient cylinder 4 compression.
Diagnose P0304 by checking Spark Plug #4, Fuel Injector #4, Ignition Coil #4, compression, fuel pressure, and intake leaks. Inspect wiring and connectors for damage or corrosion.
It is not safe to continue driving with OBD code P0304. Address the causes like faulty spark plug #4, clogged fuel injector #4, or faulty ignition coil #4 immediately.
Wrap Up
If your check engine light is on and your engine is running rough, you may have OBDII code P0304, indicating a misfire in cylinder 4. This could be caused by a faulty spark plug, ignition coil, fuel injector, or low compression in that cylinder.
To address OBDII code P0304, start by checking the spark plug, ignition coil, and fuel injector for cylinder 4. Inspect the wiring harness and connectors for any damage or corrosion that could be affecting the components’ performance.
