how to diagnose a P0302 misfire code in my Genesis G70 IG (2017-2023)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool and disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

1. Remove the ignition coil for cylinder 2 using a socket set.
2. Extract the spark plug with a spark plug socket.
3. Inspect the spark plug for signs of fouling, wear, or damage. Replace if necessary.
4. Gap the new spark plug according to manufacturer specifications.
5. Install the spark plug and torque it to the specified value (typically around 13 lb-ft).
6. Reinstall the ignition coil and ensure it is securely connected.

3. Test and Replace Ignition Coil (if necessary)

1. If the spark plug is fine, test the ignition coil resistance.
2. If the resistance is outside the specified range, remove the ignition coil.
3. Install a new ignition coil and ensure it fits properly.
4. Reconnect the battery and clear the trouble codes using the OBD-II scanner.

4. Check Fuel Injector (if necessary)

1. If the misfire persists, check the fuel injector for cylinder 2.
2. Remove the fuel injector connector and inspect for corrosion or damage.
3. Using a noid light, check if the injector is receiving a signal.
4. If no signal is present, check the wiring and connectors for faults.
5. If the injector is faulty, replace it according to the manufacturer’s specifications.

5. Compression Test (if necessary)

1. If the misfire issue still exists, conduct a compression test on cylinder 2.
2. Remove the spark plug and install the compression gauge.
3. Crank the engine and record the compression reading.
4. Compare the reading to the manufacturer’s specified compression values.
5. If the compression is low, further investigation is required for possible internal engine issues.