The OBD code P0304 for Audi 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.
A possible fix involves inspecting and repairing the components related to cylinder 4 mentioned in the causes section.
| 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 Audi p0304 OBD Code
The Audi P0304 fault code indicates a misfire in cylinder 4.
- With OBD code P0304 on an Audi, symptoms may include: Engine Light ON.
- Lack/loss of power.
- Hard start.
- Engine hesitation.
Causes of the Audi p0304 OBD Code
Misfire in cylinder 4 due to ignition system, fuel system, or mechanical issues.
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- P0304 in an Audi 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 Audi Error Code p0304 Step By Step
Address the misfire issue on cylinder 4 in the Audi by checking ignition components and fuel delivery.
- To fix the Audi OBDII code P0304, start by reviewing the possible causes related to cylinder 4 misfire.
- Visually inspect the ignition system components such as spark plugs, ignition coils, and spark plug wires for any signs of wear or damage.
- Check the fuel injector for proper operation and ensure it is delivering fuel correctly to cylinder 4.
- Test the compression in cylinder 4 to verify the engine’s mechanical condition.
- If all components check out, consider swapping the ignition coil from cylinder 4 with another cylinder to see if the misfire follows.
- Finally, reset the fault codes and test drive the vehicle to see if the issue reoccurs.
Cost Of Fixing Audi p0304 Fault Code
The repair for Audi fault code P0304 may involve replacing the ignition coil for cylinder 4.
The cost to diagnose and fix an Audi OBD code P0304 typically ranges from $75 to $150, with an estimated repair time of 1. 0 hour.
The total cost depends on labor rates, shop fees, and the complexity of the repair needed.
Details of the Audi p0304 OBD Code
Audi fault code P0304 indicates a misfire in cylinder 4.
Code P0304 means a misfire was detected in cylinder 4. It’s triggered by the Engine Control Module (ECM) based on crankshaft speed fluctuations.
The signal involved is the feedback from the crankshaft position sensor and camshaft position sensor, which the ECM uses to monitor engine misfires.
Mechanic’s Tech Notes
For Audi fault code P0304, refer to detailed diagnostic information for cylinder 4 misfire.
To diagnose and fix OBDII code P0304 on an Audi, start by checking the ignition system components like spark plugs, ignition coils, and wiring for cylinder 4. Use a voltmeter to test the coil’s primary and secondary resistance.
Inspect the fuel injector for proper operation and connection.
Perform a compression test on cylinder 4 to check for any internal engine issues.
A scan tool can help monitor live data and identify misfires.
Clear the code after repairs and test drive to ensure the issue is resolved.
If the problem persists, further diagnostics may be needed, such as checking for vacuum leaks or performing a smoke test.
FAQ
Common causes of OBD code P0304 in an Audi: Faulty Spark Plug #4, Clogged Fuel Injector #4, Faulty Ignition Coil #4, or Ignition Coil #4 circuit issues.
Diagnose P0304 misfire in Audi: Check spark plug, fuel injector, ignition coil #4. Inspect wiring for damage, connector pins for issues.
It is not safe to continue driving with OBD code P0304 on your Audi. Address the faulty spark plug, fuel injector, or ignition coil for repair.
Wrap Up
If your Audi is experiencing a misfire with OBD code P0304, it may be caused by a faulty ignition coil, spark plug, fuel injector, or low compression in cylinder 4. These issues can lead to rough idling, loss of power, and increased emissions.
To address Audi OBD code P0304, start by inspecting the spark plug, ignition coil, and fuel injector for cylinder 4. Check for any signs of wear, damage, or carbon buildup.
Test the compression in cylinder 4 to ensure it meets specifications.
Verify wiring integrity and connector tightness for
