how to fix the P0302 code on my Genesis G70 IG (2017-2023)

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, socket set, torque wrench, compression tester, new spark plugs, new ignition coil (if needed), and fuel injector cleaner.
• Disconnect the battery to ensure safety.

2. Inspect and Replace Spark Plug

• Remove Ignition Coils:
  • Use a socket set to remove the bolts securing the ignition coil on cylinder 2.
  • Gently pull the ignition coil out of the spark plug well.
• Remove Spark Plug:
  • Use a spark plug socket to remove the spark plug from cylinder 2.
  • Inspect for signs of wear, carbon buildup, or damage.
• Install New Spark Plug:
  • Gap the new spark plug as per manufacturer specifications.
  • Install the new spark plug and torque it to the manufacturer's recommended value (typically around 13 lb-ft for most applications).
• Reinstall Ignition Coil:
  • Reattach the ignition coil and secure it with the bolts.

3. Check and Replace Ignition Coil

• If the ignition coil is suspected to be faulty, swap it with a known good coil from another cylinder.
• If the misfire follows the ignition coil, replace it with a new one.
• Ensure to reconnect the electrical connector securely.

4. Inspect and Clean Fuel Injector

• If misfire persists, test the fuel injector by using a multimeter to check for proper resistance.
• If faulty, replace the fuel injector for cylinder 2.
• Consider using a fuel injector cleaner to clear any deposits if the injector is still operational.

5. Perform Compression Test

• If misfire continues after replacing the spark plug and coil, perform a compression test on cylinder 2.
• If compression is below specifications (generally 125 psi for most engines), further diagnosis of internal engine components may be necessary.