how to fix the P0301 code on my Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, ratchet, torque wrench, multimeter, compression tester, fuel injector cleaner.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover (if applicable) by unscrewing any fasteners.
  2. Disconnect the ignition coil connector for cylinder 1.
  3. Remove the ignition coil using the appropriate socket size.
  4. Remove the old spark plug using a spark plug socket.
  5. Inspect the spark plug socket for debris and clean if necessary.
  6. Install the new spark plug, torquing to the manufacturer’s specification (typically around 13-16 lb-ft).
  7. Reinstall the ignition coil and reconnect the connector.

3. Test and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. Use a multimeter to test the ignition coil’s primary and secondary resistance.
  2. If readings are outside of specifications, replace the ignition coil for cylinder 1.
  3. Install the new ignition coil and reconnect the wiring harness.

4. Clean or Replace Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector.
  2. Remove the fuel rail (if necessary) to access the injector, following specific manufacturer guidelines.
  3. Clean the injector with a fuel injector cleaner or replace it with a new one.
  4. Reinstall the fuel rail and ensure all connections are secure.

5. Compression Test (if misfire persists)

• Sub-steps:
  1. Remove the spark plug for cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine to take a reading; it should be within the manufacturer's specification (usually around 140-200 psi).
  4. If compression is low, further investigation into engine internals may be necessary.