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

Solution

1. Preparation

• Gather tools and parts.
• Park the vehicle on a flat surface, engage the parking brake, and disconnect the battery to avoid electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Sub-steps:
  1. Locate cylinder 1 spark plug (typically the front-left cylinder).
  2. Use the spark plug socket to remove the spark plug.
  3. Inspect the spark plug for wear, fouling, or damage. Replace if needed.
  4. Install the new spark plug and torque to manufacturer specification (usually around 13-15 ft-lbs).

3. Inspect and Replace Ignition Coil

• Tools Required: 10mm socket, ratchet.
• Sub-steps:
  1. Disconnect the electrical connector from the ignition coil.
  2. Remove the mounting bolts (usually 10mm) securing the ignition coil.
  3. Remove the ignition coil and inspect for damage.
  4. Install the new ignition coil in reverse order and ensure it is properly seated.

4. Check Fuel Injector

• Tools Required: Fuel pressure gauge, injector cleaner (if needed).
• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail to check pressure (should meet manufacturer specs).
  2. If pressure is low, inspect the fuel pump and filter.
  3. Consider cleaning or replacing the fuel injector if clogged.

5. Verify and Test

• After completing the repairs, reconnect the battery.
• Start the engine and monitor for any check engine lights.
• Perform a test drive to ensure the issue is resolved.