what does it mean when my Toyota Highlander has a P0302 code

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before proceeding.

2. Replace Spark Plug

1. Remove the ignition coil from cylinder 2 by unscrewing the retaining bolts.
2. Carefully pull the ignition coil out of the cylinder head.
3. Use a spark plug socket to remove the old spark plug from cylinder 2.
4. Inspect the new spark plug for correct gap specification and install it into cylinder 2.
5. Reinstall the ignition coil onto the spark plug and secure it with retaining bolts.

3. Test Ignition Coil

1. If the misfire persists after replacing the spark plug, test the ignition coil using a multimeter.
2. Compare resistance readings against the manufacturer’s specifications.
3. If out of spec, replace the ignition coil for cylinder 2.

4. Inspect and Clean Fuel Injector

1. Remove the fuel injector from cylinder 2 by disconnecting the electrical connector and removing retaining clips.
2. Inspect for clogs or leaks; clean the injector if necessary or replace it if damaged.
3. Reinstall the fuel injector and reconnect the electrical connector.

5. Final Assembly and Testing

1. Reconnect the negative battery terminal.
2. Start the engine and allow it to reach operating temperature.
3. Check for any new error codes and confirm that the check engine light is off.