how to fix the engine misfire code P0302 on my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the ignition coil connector from cylinder 2.
  3. Remove the ignition coil using a socket set.
  4. Remove the spark plug using a spark plug socket.
  5. Inspect the spark plug for wear or damage; replace it if it is fouled or worn.
  6. Install a new spark plug with a gap set to manufacturer specifications (typically around 0.043 inches).
  7. Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the spark plug is fine, test the ignition coil with a multimeter for proper resistance.
  2. If out of specification, remove the ignition coil and install a new one.
  3. Reconnect the ignition coil connector.

4. Inspect and Clean 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; clean it with a fuel injector cleaner or replace it if damaged.
  4. Reinstall the fuel rail and reconnect all wiring.

5. Conduct a Compression Test (if misfire persists)

• Sub-steps:
  1. Remove the spark plugs from all cylinders.
  2. Insert a compression tester into the spark plug hole of cylinder 2.
  3. Crank the engine and record the compression reading.
  4. Compare the readings to the manufacturer’s specifications; replace any components if readings are low.