how to fix the P0302 misfire code on my Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the ignition coil cover if applicable.
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil from cylinder 2.
• Unscrew and remove the spark plug from cylinder 2.
• Inspect the spark plug for wear or damage. Replace if necessary with the correct specification (typically NGK or Denso).
• Torque the new spark plug to manufacturer specifications (usually around 13 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil

• If the spark plug was fine, proceed to inspect the ignition coil.
• Tools Required: Socket set, torque wrench
• Remove the ignition coil from cylinder 2, as detailed previously.
• Test the ignition coil using an ohmmeter; replace if it’s outside manufacturer specifications.
• Install a new ignition coil (if necessary) and torque it to specification.

4. Inspect Fuel Injector

• If the issue persists, inspect the fuel injector.
• Tools Required: Fuel injector tester or multimeter
• Disconnect the fuel injector connector and check for proper voltage.
• If the injector is faulty, remove it using fuel injector puller tools.
• Replace with a new injector specific to the vehicle.
• Reconnect the electrical connector after installation.

5. Verify Vacuum Leaks

• Inspect all vacuum lines leading to the intake manifold.
• Replace any damaged or cracked lines.
• If necessary, use a smoke machine to identify hidden leaks.