how to fix my Toyota Tacoma N300 (2016-Present) with a P0301 code

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the engine is cool and disconnect the battery to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector from the spark plug.
  3. Remove the ignition coil from cylinder 1 by unscrewing it.
  4. Remove the spark plug using a spark plug socket.
  5. Inspect the spark plug for wear and deposits; replace with a new spark plug if necessary (specification: NGK or Denso, gap to manufacturer specification).
  6. Reinstall the spark plug and ignition coil, reconnect the connector.

3. Test and Replace Fuel Injector (if needed)

• Sub-steps:
  1. Disconnect the fuel injector connector from cylinder 1.
  2. Test the fuel injector with a multimeter for resistance (should be within manufacturer specs).
  3. If faulty, remove the fuel rail to access the injector.
  4. Replace the injector with a new one and ensure proper seating.
  5. Reconnect the fuel rail and ensure all connections are secure.

4. Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine for a few seconds and record the compression reading.
  4. Compare the reading to manufacturer specifications; replace the cylinder head gasket or perform additional repairs if compression is low.

5. Check for Vacuum Leaks

• Sub-steps:
  1. Inspect all hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to check for vacuum leaks around the intake manifold.
  3. Repair or replace any damaged hoses or gaskets.