how to fix P0301 misfire code in 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 tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface, and set the parking brake.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the ignition coil from cylinder 1.
  • Disconnect the electrical connector from the ignition coil.
  • Remove the retaining bolts and carefully pull the coil out.
• Remove the spark plug from cylinder 1.
  • Use a spark plug socket to unscrew the spark plug.
  • Inspect the spark plug for wear or fouling; replace if necessary with OEM specifications.
• Install the new spark plug.
  • Torque the spark plug to the manufacturer's specification (typically around 13 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil (if necessary)

• If the ignition coil shows signs of damage (cracks, carbon tracking), replace it.
  • Simply remove the defective coil and install the new coil using the same procedure as above.

4. Inspect and Clean Fuel Injector (if necessary)

• If the fuel injector is suspected of malfunctioning, remove it for inspection.
  • Disconnect the fuel injector electrical connector.
  • Use a fuel line tool to disconnect the fuel rail and remove the injector.
• Clean the injector using a fuel injector cleaner or replace it if it is faulty.
• Reinstall the injector and reconnect the fuel rail.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0301 error code and any other stored codes.