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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool completely before starting work.

2. Replace Spark Plug

• Remove Ignition Coil:
  • Unscrew the bolts securing the ignition coil in place with a socket set.
  • Gently pull the ignition coil out.
• Replace Spark Plug:
  • Use a spark plug socket to remove the old spark plug.
  • Inspect the old spark plug for wear or carbon buildup.
  • Install the new spark plug by hand to avoid cross-threading, then tighten to manufacturer specifications (typically around 13-16 ft-lbs).
• Reinstall Ignition Coil:
  • Place the ignition coil back into its position and secure it with the bolts.

3. Replace Fuel Injector (if necessary)

• Remove Fuel Rail:
  • Relieve fuel pressure by removing the fuel pump fuse and running the engine until it stalls.
  • Disconnect fuel lines (using appropriate tools to avoid spillage) and unbolt the fuel rail.
• Replace Injector:
  • Remove the old fuel injector from the rail.
  • Lubricate the O-rings of the new injector and install it into the fuel rail.
• Reinstall Components:
  • Reattach the fuel rail and fuel lines, ensuring no leaks.

4. Clear Codes and Test Drive

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0302 code.
• Test drive the vehicle to ensure the issue has been resolved.