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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
• Carefully pull out the spark plug using the spark plug socket.
• Inspect the spark plug condition. If it is worn, replace with a new spark plug, ensuring it matches OEM specifications.
• Torque the new spark plug to the manufacturer's specification (typically around 13 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test or Replace Ignition Coil

• Tools Required: Multimeter, socket set.
• If the ignition coil appears faulty, use a multimeter to check for proper resistance. The resistance should be within the manufacturer's specifications.
• If faulty, remove the ignition coil and replace it with a new one, ensuring it is seated correctly.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner kit, socket set.
• Remove the fuel rail to access the fuel injector for cylinder 2.
• Inspect the injector for clogs or damage. If necessary, clean the injector with a fuel injector cleaning kit or replace it with a new one.
• Reassemble the fuel rail and ensure all connections are secure.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 2 and insert the compression tester.
• Crank the engine and record the compression reading. Compare the result with specifications from the manufacturer's manual.
• If the compression is low, further inspection of valves and piston rings may be needed.