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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the engine is cool. Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Needed: Socket set, torque wrench, dielectric grease.
• Steps:
  1. Remove the engine cover if necessary.
  2. Disconnect the ignition coil connector on cylinder 2.
  3. Remove the ignition coil using a socket.
  4. Unscrew the spark plug using a spark plug socket.
  5. Inspect the spark plug for wear; replace it if necessary. Ensure the gap is set to manufacturer specifications (typically around 0.043 inches).
  6. Apply dielectric grease to the ignition coil boot, then reinstall the spark plug and ignition coil.

3. Test and Replace Ignition Coil (if needed)

• Tools Needed: Multimeter, socket set.
• Steps:
  1. Test the ignition coil for resistance using a multimeter (consult specifications for resistance values).
  2. If the coil is outside of specifications, install a new ignition coil for cylinder 2.
  3. Reconnect the ignition coil connector.

4. Inspect and Replace Fuel Injector (if needed)

• Tools Needed: Fuel injector removal tool, socket set.
• Steps:
  1. Disconnect the fuel line and relieve fuel pressure by removing the fuel pump fuse and cranking the engine.
  2. Remove the injector connector and retain the clips.
  3. Remove the fuel injector from the rail.
  4. Install the new fuel injector, ensuring proper seating and connection.
  5. Reconnect the fuel line and check for leaks after reassembling.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0302 code and any other related codes.