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

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 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 cylinder 1 ignition coil.
  3. Remove the ignition coil retaining bolts and carefully pull the coil out.
  4. Remove the spark plug using a spark plug socket and ratchet.
  5. Inspect the spark plug for wear or damage; replace it if necessary.
  6. Install the new spark plug to the manufacturer's specified torque (typically 13-15 lb-ft).
  7. Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug is fine, check the ignition coil for proper function.
  2. If needed, replace the ignition coil with a new one.
  3. Torque the ignition coil bolts to the manufacturer’s specifications.
  4. Reconnect the ignition coil connector.

4. Test Fuel Injector

• Sub-steps:
  1. Disconnect the electrical connector from the fuel injector on cylinder 1.
  2. Use a multimeter to test the injector's resistance according to specifications (typically around 12-16 ohms).
  3. If the injector is faulty, replace it with a new one.
  4. Reconnect the injector and secure any retaining clips.

5. Clear Codes and Test Drive

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0301 code.
  3. Start the engine and allow it to idle, checking for any misfires.
  4. Take the vehicle for a test drive to ensure the issue is resolved.