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

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Locate the spark plug for cylinder 1 (front left, near the engine).
  2. Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
  3. Use a spark plug socket and ratchet to remove the spark plug.
  4. Inspect the spark plug for wear or damage; replace it if necessary.
  5. Install the new spark plug by hand, then torque it to 13 lb-ft (17.6 Nm).
  6. Reinstall the ignition coil, ensuring it is securely connected.

3. Inspect and Replace Ignition Coil (if needed)

• Sub-steps:
  1. If the ignition coil is damaged, remove it from the engine.
  2. Disconnect the electrical connector and unscrew the coil.
  3. Install the new ignition coil, ensuring it is seated properly.
  4. Reconnect the electrical connector and secure with screws.

4. Inspect Fuel Injector

• Sub-steps:
  1. Remove the intake manifold if necessary to access the fuel injector.
  2. Disconnect the fuel injector electrical connector and fuel lines (ensure to relieve fuel pressure first).
  3. Inspect the injector for clogs or damage; clean or replace if necessary.
  4. Reinstall the fuel injector and reconnect the electrical connector and fuel lines.

5. Conduct Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression gauge into the spark plug hole.
  3. Crank the engine for a few seconds and record the compression reading.
  4. Compare with manufacturer's specifications (should be around 180-200 psi).
  5. If low, further investigation is needed for internal engine issues.