how to fix the P0301 misfire code in my Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface, and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the ignition coil from cylinder one by disconnecting the electrical connector and removing the mounting bolts.
  2. Extract the spark plug using a spark plug socket and ratchet.
  3. Inspect the old spark plug for signs of fouling or wear.
  4. Apply anti-seize lubricant to the threads of the new spark plug.
  5. Install the new spark plug and torque it to 13 lb-ft (17.6 Nm).
  6. Reinstall the ignition coil and connect the electrical connector.

3. Inspect and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the ignition coil is faulty, remove it from the cylinder head.
  2. Install the new ignition coil and ensure it is seated properly.
  3. Reconnect the electrical connector to the new ignition coil.

4. Test Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder one.
  2. Use a noid light to check for power at the injector connector during cranking; replace the injector if no signal is present.
  3. If the injector is faulty, remove it from the fuel rail and replace it with a new one.
  4. Reconnect the fuel injector connector.

5. Final Checks

• Reconnect the battery.
• Clear the trouble codes using an OBD-II scanner.
• Start the engine and observe for any misfires.