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

Solution

1. Preparation

• Gather tools and parts before starting the repair.
• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel injector cleaning kit.
• Safety Warnings: Disconnect the battery before working on electrical systems.

2. Replace Spark Plug and Ignition Coil

1. Remove the engine cover (if applicable) by unscrewing any retaining bolts.
2. Disconnect the ignition coil connector for cylinder 2.
3. Remove the bolt securing the ignition coil and gently pull it out.
4. Remove the spark plug using a spark plug socket and ratchet.
5. Install the new spark plug and torque to the manufacturer's specification (typically 15-20 lb-ft).
6. Install the new ignition coil and secure it with the bolt.
7. Reconnect the ignition coil connector.

3. Test and Clean Fuel Injector

1. Disconnect the fuel injector connector for cylinder 2.
2. Use a noid light to check for injector pulse; if no pulse is detected, check wiring and connectors.
3. If the injector is not functioning, remove it by unscrewing any retaining clips and pulling it out.
4. Clean the fuel injector using a fuel injector cleaning kit or replace it with a new one.
5. Reinstall the fuel injector and reconnect the connector.

4. Compression Test

1. Remove the spark plug for cylinder 2 again to access the combustion chamber.
2. Insert the compression tester into the spark plug hole and crank the engine.
3. Note the reading; it should be within the manufacturer's specification (typically 140-200 psi).
4. If compression is low, further investigation is needed to determine the cause (e.g., valve issues, piston rings).