how to fix P0302 misfire code on my Toyota Highlander

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down completely.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 2 by unscrewing the mounting bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the removed spark plug for wear and replace it with a new spark plug, ensuring it is gapped correctly according to manufacturer specifications.
• Reinstall the ignition coil onto the new spark plug.

3. Replace Ignition Coil (if needed)

• If the ignition coil appears faulty during inspection, proceed to replace it.
• Tools Required: Socket set, torque wrench.
• Disconnect the electrical connector and remove the ignition coil from the spark plug.
• Install the new ignition coil and reconnect the electrical connector.
• Ensure that the ignition coil is securely mounted.

4. Check and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit (if applicable), wrench set.
• Disconnect the fuel injector connector for cylinder 2.
• Remove the fuel injector using a fuel injector puller or appropriate wrench.
• Inspect the fuel injector for clogs or debris. Clean or replace if necessary.
• Reinstall the fuel injector and reconnect the electrical connector.

5. Reassemble and Test

• Reconnect the negative battery terminal.
• Start the engine and check for any abnormal noises or symptoms.
• Monitor the check engine light to see if it reactivates.