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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before beginning work.

2. Inspect and Replace Ignition Components

• Inspect Ignition Coil:

  • Remove the engine cover if applicable.
  • Disconnect the electrical connector from the ignition coil for cylinder 2.
  • Remove the ignition coil using a socket set.
  • Tools Required: Socket set, ratchet.

• Test Ignition Coil:

  • Use a multimeter to measure the resistance of the ignition coil. Compare readings to specifications in the service manual.
  • If the coil is faulty, replace it with a new one.

• Replace Spark Plug:

  • Remove the spark plug using a spark plug socket.
  • Inspect the spark plug for wear or damage. Replace if necessary.
  • Apply anti-seize compound to the threads of the new spark plug and install it to the manufacturer’s torque specifications (typically around 13-20 lb-ft).

3. Inspect and Clean Fuel Injector

• Remove Fuel Injector:

  • Disconnect the fuel line and electrical connector from the fuel injector.
  • Remove any retaining clips or bolts holding the injector in place.

• Clean or Replace Injector:

  • If cleaning, soak the injector in a professional cleaning solution and use an ultrasonic cleaner if available.
  • If the injector is damaged, replace it with a new one.

• Reassemble Components:

  • Reinstall the injector, ensuring proper seating and reattach all connectors.

4. Recheck System

• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.
• Monitor for any error codes or abnormalities in engine performance.