how to fix the engine misfire in my Toyota Camry XV70 (2018-2024) with code P0302?

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to avoid electrical shocks.
• Allow the engine to cool down before working.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench, dielectric grease
• Remove the engine cover if necessary.
• Disconnect the ignition coil connector for cylinder 2.
• Remove the ignition coil by unscrewing the retaining bolts.
• Remove the spark plug using the spark plug socket.
• Inspect the old spark plug and clean the area around the spark plug hole.
• Install the new spark plug, tightening it to the manufacturer’s specified torque (typically around 13-16 lb-ft).
• Apply dielectric grease to the ignition coil boot before reinstalling.

3. Replace Ignition Coil (if necessary)

• Tools Required: Ratchet, socket set
• If the spark plug replacement did not resolve the issue, remove the ignition coil for cylinder 2.
• Install the new ignition coil, ensuring it is securely fastened.
• Reconnect the ignition coil connector.

4. Inspect/Replace Fuel Injector (if necessary)

• Tools Required: Fuel line disconnect tool, wrench set
• Relieve fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
• Disconnect the fuel line from the injector.
• Remove the retaining clips and electrical connector from the fuel injector.
• Replace with a new fuel injector if it is faulty.

5. Reassemble and Reconnect Battery

• Reinstall any components removed during the process.
• Reconnect the negative battery terminal.
• Start the engine to check for any misfire codes.