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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before proceeding.

2. Replace Spark Plug

• Remove the ignition coil cover, if present.
• Disconnect the ignition coil connector for cylinder 2.
• Unbolt the ignition coil using a socket wrench and remove it.
• Remove the spark plug using a spark plug socket.
• Inspect the old spark plug; if worn or fouled, replace it with a new one (check gap specification).
• Install the new spark plug and torque it to the manufacturer's specification (typically around 13-16 ft-lbs).
• Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil

• If the spark plug replacement does not resolve the issue, proceed to inspect the ignition coil.
• Remove the ignition coil for cylinder 2 as previously described.
• Test the ignition coil using a multimeter to ensure it is functioning correctly (primary resistance should typically be between 0.4-2.0 ohms).
• If faulty, replace the ignition coil with a new one and reinstall.

4. Clean or Replace Fuel Injector

• If ignition components check out, inspect the fuel injector for cylinder 2.
• Remove the fuel rail (ensure fuel pressure is released before disassembly).
• If clogged, clean the injector using a fuel injector cleaner or replace it with a new one.
• Reassemble the fuel rail and ensure all connections are secure.

5. Final Checks

• Reconnect the negative battery terminal.
• Clear any fault codes using the OBD-II scanner.
• Start the engine and check for smooth operation.