how to resolve P0301 misfire code in my Genesis G70 IG (2017-2023)?

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Use a socket set to remove the bolts securing the ignition coil.
  • Gently lift the ignition coil straight up to avoid damaging the spark plug.
• Remove the spark plug:
  • Use a spark plug socket and ratchet to unscrew the spark plug from the cylinder head.
• Inspect the spark plug for wear, fouling, or damage. Replace if necessary:
  • Use a new spark plug that meets the manufacturer's specifications (check gap as per service manual).
• Reinstall the spark plug and ignition coil:
  • Torque the spark plug to 13 lb-ft (17.6 Nm).
  • Reattach the ignition coil and secure it in place.

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil:
  • Use a multimeter to check the resistance; replace if it does not meet specifications.
• Install the new ignition coil, ensuring it is seated properly.

4. Clean or Replace Fuel Injector

• If misfire persists after replacing the spark plug and ignition coil:
  • Disconnect the fuel injector electrical connector.
  • Remove the fuel injector by unbolting or unclipping it from the fuel rail.
  • Inspect for clogs or damage. Clean using an appropriate injector cleaner or replace if necessary.
• Reinstall the fuel injector and reconnect the electrical connector.

5. Reassemble and Reconnect

• Reconnect the negative battery terminal.
• Ensure all components are secured and wiring is intact.