how to fix misfire code P0302 in my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

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

2. Inspect and Replace Ignition Components

• Spark Plug Replacement:

  • Remove the ignition coil from cylinder 2 by unscrewing the bolts and disconnecting the electrical connector.
  • Use a spark plug socket to remove the spark plug from cylinder 2.
  • Inspect the spark plug for wear or fouling; replace it if necessary.
  • Install a new spark plug, tightening to the manufacturer’s specified torque (typically around 13-15 lb-ft).

• Ignition Coil Replacement:

  • If the spark plug is in good condition, check the ignition coil for damage.
  • If needed, replace the ignition coil for cylinder 2.
  • Reattach the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Fuel Injector

• Remove the fuel rail if necessary to access the fuel injector for cylinder 2.
• Disconnect the fuel injector connector and remove the injector from the rail.
• Inspect the injector for clogs or damage; replace if necessary.
• Reinstall the new injector and ensure all connections are secure.

4. Compression Test

• Use a compression tester to check the compression in cylinder 2.
• If the compression is below specifications, further investigation may be needed (e.g., checking for a blown head gasket or valve issues).

5. Reassemble and Reconnect Battery

• Reassemble any components that were removed during the inspection and repairs.
• Reconnect the negative battery terminal.