how to troubleshoot P0302 misfire code in Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the ignition coil from cylinder 2 by unscrewing the mounting bolts and disconnecting the electrical connector.
  2. Remove the spark plug using a spark plug socket and ratchet.
  3. Inspect the spark plug for signs of wear or damage (e.g., carbon buildup, broken electrodes).
  4. If necessary, replace the spark plug with a new one that meets manufacturer specifications (typically NGK or Denso).
  5. Reinstall the ignition coil and reconnect it to the electrical connector.

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug is in good condition, remove the ignition coil from cylinder 2 again.
  2. Test the ignition coil using an ohmmeter to ensure it operates within specified resistance values.
  3. If defective, replace the ignition coil with a new one.
  4. Reinstall the ignition coil.

4. Inspect Fuel Injector

• Sub-steps:
  1. Disconnect the electrical connector from the fuel injector for cylinder 2.
  2. Remove the fuel rail bolts and gently lift the fuel rail away to access the injector.
  3. Check the injector for clogs or leaks. Clean or replace the injector if necessary.
  4. Reinstall the fuel rail and reconnect the fuel injector.

5. Final Checks

• Sub-steps:
  1. Reconnect the battery terminal.
  2. Start the engine and let it idle to check for smooth operation.
  3. Clear the P0302 code using the OBD-II scanner and take the vehicle for a test drive.