how to fix P0301 code on my Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a flat surface and secured with wheel chocks.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Locate cylinder 1 spark plug (usually at the front of the engine).
  3. Disconnect the ignition coil connector and remove the ignition coil.
  4. Remove the spark plug using a spark plug socket and ratchet.
  5. Inspect the spark plug for wear or fouling; replace if necessary (use OEM specifications).
  6. Install the new spark plug and torque it to manufacturer specifications (typically around 13 ft-lbs).
  7. Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug is in good condition, test the ignition coil using a multimeter.
  2. If faulty, disconnect the ignition coil connector and remove the coil.
  3. Install the new ignition coil, ensuring it is seated properly.
  4. Reconnect the ignition coil connector.

4. Test Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Use a multimeter to check the injector’s resistance; compare with manufacturer specifications.
  3. If faulty, remove the fuel rail and replace the injector.
  4. Reinstall the fuel rail and reconnect the injector connector.

5. Check for Vacuum Leaks

• Sub-steps:
  1. Inspect all vacuum hoses and the intake manifold for cracks or disconnections.
  2. Use a smoke machine or carb cleaner to test for leaks while the engine is running.
  3. Repair or replace any damaged hoses or seals.