how to fix P0302 misfire code on Genesis G70 IG (2017-2023)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical shock.
• Ensure the vehicle is parked on a flat surface and secured with wheel chocks.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Locate the spark plug for cylinder 2, identified in the vehicle’s service manual.
• Using the spark plug socket, remove the old spark plug carefully.
• Inspect the spark plug for wear or damage. Replace it with a new spark plug that meets manufacturer specifications (check gap).
• Torque the new spark plug to the manufacturer's specified value (usually around 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Disconnect the electrical connector from the ignition coil for cylinder 2.
• Remove the mounting bolts securing the ignition coil.
• Replace the ignition coil with a new unit ensuring it is seated correctly.
• Reconnect the electrical connector and torque the mounting bolts to the recommended specification.

4. Check Fuel Injector

• Tools Required: Fuel pressure gauge, injector cleaner (if necessary).
• Connect the fuel pressure gauge to the fuel rail and turn the ignition to the ON position without starting the engine. Check the fuel pressure against specifications.
• If pressure is low, inspect the fuel pump and fuel filter.
• If fuel delivery is confirmed but misfiring persists, consider cleaning or replacing the fuel injector for cylinder 2.

5. Reassemble and Test

• Reinstall the engine cover if it was removed.
• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.