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

Solution

1. Preparation

• Gather all necessary tools and parts before starting.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Sub-steps:
  1. Remove the ignition coil from cylinder 2 by unscrewing the retaining bolts and lifting the coil out.
  2. Unscrew the spark plug using a spark plug socket.
  3. Inspect the spark plug for wear or deposits; replace it if necessary.
  4. Install the new spark plug, torquing it to the manufacturer's specifications (typically around 13-15 lb-ft).
  5. Reinstall the ignition coil and secure it with bolts.

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set
• Sub-steps:
  1. If the spark plug was fine, proceed to inspect the ignition coil.
  2. Remove the ignition coil from cylinder 2 as previously described.
  3. Test the ignition coil using a multimeter to check for proper resistance; replace if out of specification.
  4. Install the new ignition coil, ensuring it is seated properly.

4. Inspect and Replace Fuel Injector

• Tools Required: Fuel injector puller (if necessary), socket set
• Sub-steps:
  1. Remove the fuel rail to access the injector for cylinder 2.
  2. Disconnect the fuel injector connector and remove it from the fuel rail.
  3. Inspect or replace the fuel injector if it is faulty.
  4. Reassemble the fuel rail and reconnect all connectors.

5. Compression Test (if needed)

• Tools Required: Compression tester
• Sub-steps:
  1. Remove the spark plug from cylinder 2.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine and record the compression reading.
  4. Compare the reading to the manufacturer's specifications; if low, further engine diagnosis may be necessary.