The OBD code P0304 for Hyundai indicates a misfire in cylinder 4. This affects the engine’s performance, causing symptoms like engine light on, lack of power, hard starting, and hesitation.
Common causes include a faulty spark plug, clogged fuel injector, or ignition coil issues.
While not an immediate danger, it can lead to further engine damage if left unresolved.
To fix, inspect and potentially replace the spark plug, fuel injector, or ignition coil in cylinder 4, and check related wiring for any faults.
| 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 Hyundai p0304 OBD Code
The vehicle may experience rough idling or a noticeable lack of power.
- With Hyundai OBD code P0304, the Engine Light will be ON.
- Lack/loss of power may be experienced.
- Hard start can occur when trying to start the engine.
- Engine hesitation might be felt while driving.
Causes of the Hyundai p0304 OBD Code
Possible reasons for Hyundai fault code P0304 include ignition system issues and fuel injector problems.
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- 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 Hyundai Error Code p0304 Step By Step
Address the misfire on cylinder 4 in a Hyundai by checking spark plugs and ignition components.
- To fix a Hyundai OBDII code P0304, start by reviewing 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 such as loose connections or corrosion.
- Test the compression in cylinder 4 to ensure it is within specifications.
- If necessary, replace the spark plug, ignition coil, or fuel injector for cylinder 4.
- Clear the fault code and test drive the vehicle to verify the repair.
Cost Of Fixing Hyundai p0304 Fault Code
The repair for Hyundai fault code P0304 may involve replacing the ignition coil for cylinder 4.
The cost to diagnose and fix a Hyundai OBD code P0304 is typically based on 1. 0 hour of labor, with rates ranging from $75 to $150 per hour.
The total cost can vary depending on shop rates, complexity of the issue, and any additional parts or services needed.
Details of the Hyundai p0304 OBD Code
Hyundai fault code P0304 indicates a misfire in cylinder 4.
Code P0304 means a misfire was detected in cylinder 4 of the engine.
This code is triggered by the Engine Control Module (ECM) when it detects a deviation in crankshaft speed caused by a misfire in cylinder 4 during the engine’s operation.
The ECM monitors the engine’s crankshaft speed using data from the crankshaft position sensor and compares it to the expected values for smooth engine operation.
If a misfire occurs in cylinder 4, it disrupts the crankshaft speed pattern, leading the ECM to set code P0304.
Mechanic’s Tech Notes
Detailed information on diagnosing and repairing Hyundai fault code P0304 related to cylinder 4 misfire.
To diagnose and fix OBDII code P0304 on a Hyundai, start by checking the ignition system components for cylinder 4. Use a voltmeter to test the spark plug, ignition coil, and spark plug wire for proper operation.
Inspect for any signs of wear or damage.
Additionally, perform a compression test on cylinder 4 to ensure engine mechanical health.
If these components check out, consider checking the fuel injector for proper operation and connectivity.
A scan tool can help monitor live data and identify any abnormalities in the fuel system.
Lastly, inspect the wiring harness and connectors related to cylinder 4 for any issues.
Addressing these areas can help resolve the misfire issue indicated by code P0304.
FAQ
Common causes of OBD code P0304 in a Hyundai: Faulty Spark Plug #4, Clogged Fuel Injector #4, Faulty Ignition Coil #4, or poor electrical connections. Inspect and repair as needed.
Diagnose P0304 misfire in Hyundai: Check spark plug, fuel injector, ignition coil #4. Inspect wiring for damage, poor connections. Repair/replace faulty components as needed.
It is not safe to continue driving with OBD code P0304 on a Hyundai. Address the causes like faulty spark plug, fuel injector, or ignition coil immediately.
Wrap Up
If your Hyundai is running rough with OBD code P0304, it may be caused by a misfiring cylinder, faulty spark plug, ignition coil issue, or a vacuum leak near cylinder 4. Check spark plugs, ignition coils, and vacuum lines for wear or damage.
To resolve Hyundai OBD code P0304, inspect spark plugs for fouling, test ignition coils for proper operation, and check vacuum lines for leaks.
Replace any faulty components and ensure proper connections in the affected cylinder’s ignition system.
