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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Spark Plug Replacement

• Tools Required: Socket set, torque wrench, spark plug socket.
• Steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector from the spark plug.
  3. Remove the ignition coil securing bolts and take out the ignition coil.
  4. Use a spark plug socket to remove the old spark plug from cylinder 1.
  5. Install a new spark plug, ensuring it is gapped according to manufacturer specifications (typically around 0.043 inches).
  6. Torque the spark plug to the specified value (usually around 13 lb-ft).
  7. Reinstall the ignition coil and secure it with bolts.
  8. Reconnect the ignition coil connector.

3. Ignition Coil Inspection/Replacement

• Tools Required: Multimeter, socket set.
• Steps:
  1. Use a multimeter to check the ignition coil's primary and secondary resistance according to specifications.
  2. If readings are out of range, replace the ignition coil.
  3. Install the new ignition coil and reconnect the harness.

4. Fuel Injector Check

• Tools Required: Fuel pressure gauge, injector cleaning kit (if needed).
• Steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Start the engine and check fuel pressure to ensure it meets specifications.
  3. If the pressure is low or fluctuating, inspect the fuel pump and filter.
  4. If necessary, clean or replace the fuel injector for cylinder 1.

5. Compression Test

• Tools Required: Compression tester.
• Steps:
  1. Remove the spark plug from cylinder 1.
  2. Install the compression tester in the spark plug hole.
  3. Crank the engine for a few seconds and record the compression reading.
  4. Compare the reading with manufacturer specifications; a significant deviation may indicate internal engine issues.