how do I fix a P0301 misfire code in my Toyota RAV4 XA50 (2019-2024)?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, compression tester, torque wrench.
• Ensure the vehicle is parked on a flat surface and the engine is cool.

2. Replace Spark Plug

• Sub-steps:
  1. Disconnect the negative battery terminal.
  2. Remove the engine cover if applicable.
  3. Remove the ignition coil from cylinder 1 by unscrewing the mounting bolts.
  4. Pull out the old spark plug using a spark plug socket.
  5. Install a new spark plug (ensure it is the correct type and gap as per manufacturer's specifications).
  6. Reinstall the ignition coil and secure it with the bolts.
  7. Reconnect the negative battery terminal.

3. Inspect and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the ignition coil was found faulty during testing, remove the coil from cylinder 1.
  2. Install the new ignition coil, ensuring it is seated properly.
  3. Reconnect the electrical connector to the ignition coil.

4. Check Fuel Injector

• Sub-steps:
  1. If injector issues were suspected, disconnect the fuel injector connector at cylinder 1.
  2. Use an ohmmeter to measure the resistance of the fuel injector; replace if out of spec.
  3. Reconnect the injector and ensure it clicks into place.

5. Test Drive

• Start the engine and let it idle for a few minutes to check for any error codes.
• Perform a test drive to ensure the engine runs smoothly without misfires.