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

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shock.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover, if applicable, to access the spark plugs.
  2. Use a socket wrench to remove the spark plug wire from cylinder 1.
  3. Use a spark plug socket to unscrew and remove the old spark plug.
  4. Inspect the new spark plug for proper gap and install it into cylinder 1.
  5. Tighten the spark plug to the manufacturer’s specification (typically around 13-15 lb-ft).

3. Check and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. Disconnect the electrical connector from the ignition coil on cylinder 1.
  2. Remove the mounting bolts securing the ignition coil and carefully pull it out.
  3. Install the new ignition coil by reversing the removal steps.
  4. Reconnect the electrical connector ensuring it clicks into place.

4. Inspect Fuel Injector

• Sub-steps:
  1. Remove any components obstructing access to the fuel injector on cylinder 1.
  2. Disconnect the fuel injector electrical connector.
  3. Use a multimeter to check the injector resistance (specifications can vary; refer to service manual).
  4. Replace the fuel injector if it is found to be faulty.
  5. Reconnect the fuel injector and any removed components.

5. Reconnect Battery and Start Engine

• Reconnect the battery terminals.
• Start the engine and allow it to reach operating temperature.