how to fix P0301 misfire code in my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

1. Remove Engine Cover (if applicable):

   • Use a socket set to remove any screws or bolts securing the engine cover and lift it off.

2. Remove Ignition Coil:

   • Detach the electrical connector from the ignition coil on cylinder 1.
   • Remove the bolt securing the ignition coil using a socket.
   • Carefully pull the ignition coil out of the spark plug well.

3. Remove Spark Plug:

   • Use a spark plug socket and ratchet to unscrew and remove the spark plug from cylinder 1.

4. Inspect Spark Plug:

   • Examine the spark plug for wear, carbon buildup, or damage. Replace if necessary.
   • Ensure the new spark plug has the correct gap according to the manufacturer’s specifications.

5. Install New Spark Plug:

   • Insert the new spark plug into the cylinder head and tighten it to the specified torque (typically around 13-15 lb-ft).

6. Reinstall Ignition Coil:

   • Place the ignition coil back onto the spark plug and secure it with the bolt.
   • Reconnect the electrical connector.

3. Inspect and Replace Ignition Coil (if needed)

1. Check Ignition Coil:

   • If the spark plug appears normal, test the ignition coil using a multimeter to ensure it’s functioning properly.
   • Replace the ignition coil if it fails the test.

2. Install New Ignition Coil:

   • Follow the previous steps to install the new ignition coil if replacement is necessary.

4. Clear Codes and Test Drive

1. Reconnect Battery:

   • Reconnect the negative battery terminal.

2. Clear Codes:

   • Use the OBD-II scanner to clear the codes from the vehicle's computer.

3. Test Drive:

   • Take the vehicle for a short drive to ensure the check engine light does not reappear and that the engine runs smoothly.