how to fix P0301 misfire code in Toyota Tacoma N300 (2016-Present)?

Solution

1. Preparation

• Gather tools and parts, ensure the vehicle is parked on a flat surface, and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, gap gauge.
• Sub-steps:
  1. Remove the engine cover (if applicable) by unscrewing the fasteners.
  2. Locate the spark plug for cylinder 1 (usually the front-left cylinder).
  3. Use a socket wrench to remove the spark plug.
  4. Inspect the spark plug for signs of wear, carbon buildup, or damage. Replace if necessary.
  5. Check the gap on the new spark plug using a gap gauge; adjust if necessary to the manufacturer's specification (typically around 0.044 inches).
  6. Install the new spark plug and torque to the manufacturer's specification (usually around 13 ft-lbs).

3. Check and Replace Ignition Coil

• Tools Required: Socket set, multimeter.
• Sub-steps:
  1. Disconnect the electrical connector from the ignition coil.
  2. Remove the ignition coil from cylinder 1 by unscrewing the mounting bolts.
  3. Using a multimeter, check the resistance of the ignition coil. Compare with manufacturer specifications.
  4. If the coil is faulty, replace it with a new one.
  5. Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect and Test Fuel Injector

• Tools Required: Fuel injector tester (if available).
• Sub-steps:
  1. Disconnect the fuel injector connector from cylinder 1.
  2. Use a fuel injector tester to check the injector's operation; ensure it is receiving the correct signal.
  3. If the injector is not functioning properly, replace it with a new one.
  4. Reconnect the fuel injector connector.

5. Compression Test (if necessary)

• Tools Required: Compression tester.
• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine and record the compression reading.
  4. Compare the reading to manufacturer specifications (typically around 180 psi).
  5. If compression is low, further investigation into mechanical issues (like valve or head gasket problems) is needed.