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

Solution

1. Preparation

• Tools Required: OBD-II scanner, compression gauge, socket set, multimeter, fuel injector cleaner.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before beginning work.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector for cylinder 1.
  3. Unscrew and remove the ignition coil from cylinder 1.
  4. Remove the spark plug using a spark plug socket and ratchet.
  5. Inspect the spark plug for wear or damage; replace if necessary (use OEM specifications).
  6. Install the new spark plug, tightening to the manufacturer's torque specification (typically 13-16 ft-lbs).
  7. Reinstall the ignition coil and connect the electrical connector.

3. Check and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. Use a multimeter to test the ignition coil's primary and secondary resistance according to the service manual specifications.
  2. If the coil is faulty, remove it and replace it with a new one.
  3. Reconnect the ignition coil connector.

4. Inspect and Clean Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Remove the fuel rail (if required) to access the injector.
  3. Inspect the fuel injector for clogs or debris.
  4. Clean the injector using fuel injector cleaner or replace it if necessary.
  5. Reinstall the fuel rail and reconnect the injector connector.

5. Check Compression

• Sub-steps:
  1. Insert the compression gauge into the spark plug hole of cylinder 1.
  2. Crank the engine several times to obtain a reading.
  3. Compare the result with the manufacturer's specifications. If low, further diagnosis may be required.