how to fix P0302 misfire code on my Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover, if applicable.
  2. Disconnect the ignition coil connector from cylinder 2.
  3. Unbolt the ignition coil and remove it from the spark plug.
  4. Remove the spark plug using a spark plug socket.
  5. Inspect the spark plug for wear, carbon buildup, or damage; replace if necessary.
  6. Gap the new spark plug to manufacturer's specifications (typically around 0.043 inches for Toyota).
  7. Install the new spark plug, torque to the manufacturer’s specifications (approximately 13 lb-ft).
  8. Reinstall the ignition coil and reconnect the connector.

3. Inspect and Test Ignition Coil

• Sub-steps:
  1. Remove the ignition coil from cylinder 2 as previously described.
  2. Test the ignition coil using a multimeter to check for proper resistance values (consult service manual for specific values).
  3. If faulty, replace the ignition coil with a new one.
  4. Reinstall the ignition coil after testing.

4. Check Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 2.
  2. Remove the fuel rail if necessary to access the injector.
  3. Inspect the fuel injector for clogs or leaks; clean or replace if needed.
  4. Reinstall the fuel injector and reconnect the connector.

5. Check Compression (if necessary)

• Sub-steps:
  1. Remove the spark plug from cylinder 2.
  2. Insert a compression tester into the spark plug hole.
  3. Crank the engine several times to get a compression reading.
  4. Compare the reading to manufacturer specifications (typically around 150-200 psi).
  5. If compression is low, further investigation may be required (e.g., checking valves or head gasket).