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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.
• Allow the engine to cool before beginning work.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector for cylinder 2.
  3. Remove the ignition coil from cylinder 2 using a socket set.
  4. Remove the spark plug using a spark plug socket and ratchet.
  5. Inspect the spark plug for wear, carbon deposits, or damage; replace if needed.
  6. Gap the new spark plug to manufacturer specifications (usually around 0.030-0.035 inches).
  7. Install the new spark plug and torque to the manufacturer’s specification (typically around 13 lb-ft).
  8. Reinstall the ignition coil and reconnect the connector.

3. Test Ignition Coil

• Sub-steps:
  1. Swap the ignition coil from cylinder 2 with another cylinder (e.g., cylinder 1).
  2. Clear the OBD-II codes using the scanner.
  3. Start the engine and check for a check engine light; if the misfire code follows the ignition coil, replace it.
  4. If not, reinstall the original coil.

4. Check Fuel Injector

• Sub-steps:
  1. Remove the fuel rail to access the fuel injector for cylinder 2.
  2. Inspect the injector for clogs or damage; clean or replace if necessary.
  3. Reinstall the fuel rail and ensure all connections are secure.

5. Compression Test (if needed)

• Sub-steps:
  1. Remove the spark plugs.
  2. Insert a compression gauge into the spark plug hole of cylinder 2.
  3. Crank the engine to obtain a compression reading; compare it to manufacturer specifications.
  4. If compression is low, further engine diagnosis may be required.

Tools Required:

• OBD-II scanner
• Socket set
• Ratchet and spark plug socket
• Torque wrench
• Compression gauge
• Fuel injector cleaning kit (if necessary)

Parts Required:

• Spark plug (specific model)
• Ignition coil (if faulty)
• Fuel injector (if faulty)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect battery before working on electrical systems.
• Allow engine to cool before opening components.