how to fix the P0301 misfire code on my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery negative terminal to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 1:
  • Disconnect the electrical connector.
  • Unbolt the coil and carefully pull it out.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear or damage; replace it if necessary.
• Install a new spark plug, torque it to the manufacturer's specifications (usually around 13-20 lb-ft).
• Reinstall the ignition coil.

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil:
  • Use a multimeter to check the primary and secondary resistance.
• If the coil is faulty, replace it with a new one.
• Reconnect the electrical connector and ensure it clicks into place.

4. Inspect and Clean Fuel Injector

• If the ignition system is functioning properly, check the fuel injector:
  • Remove the fuel rail assembly if necessary to access the injector.
  • Inspect the injector for clogs or leaks.
  • Clean the injector using a fuel injector cleaner or replace it if cleaning does not help.
• Reassemble the fuel rail and ensure all connections are secure.

5. Check for Vacuum Leaks

• With the engine running, use a smoke machine or carburetor cleaner to check for vacuum leaks around the intake manifold.
• Repair any leaks found by replacing gaskets or hoses.