how to fix P0301 misfire code on Genesis G70 IG (2017-2023)

Learn how to diagnose and fix P0301 cylinder 1 misfire in Genesis G70 IG (2017-2023). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter.
• Ensure the vehicle is parked on a level surface and the engine is cool. Disconnect the negative battery terminal to ensure safety.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Disconnect the ignition coil connector from cylinder 1.
• Remove the ignition coil using a socket.
• Remove the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for wear; replace with a new spark plug if necessary. Use the manufacturer’s recommended spark plug type.
• Install the new spark plug to the specified torque (typically around 13-15 lb-ft).
• Reinstall the ignition coil and connector.

3. Check and Replace Ignition Coil

• If the misfire persists after replacing the spark plug, test the ignition coil by swapping it with another cylinder.
• If the misfire code changes to the cylinder where the coil was swapped, replace the faulty ignition coil.
• Install the new ignition coil, ensuring proper seating and connection.

4. Inspect and Clean Fuel Injector

• If the ignition coil is functioning, check the fuel injector for cylinder 1.
• Remove the fuel injector connector and use a multimeter to test for power and ground.
• If the injector is clogged, remove it and clean it with an appropriate injector cleaner or replace it if necessary.
• Ensure proper installation and connection of the injector.

5. Compression Test

• Conduct a compression test on cylinder 1 to check for internal engine issues.
• If the compression is below specifications (typically around 120-200 psi), further investigation into engine internals may be required.