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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Locate and disconnect the electrical connector from the ignition coil on cylinder 1.
  3. Remove the ignition coil (usually secured with a bolt).
  4. Extract the spark plug using a spark plug socket.
  5. Inspect the spark plug for wear and replace it if necessary (use OEM specifications for gap).
  6. Reinstall the spark plug and ignition coil, reconnecting the electrical connector.

3. Test and Replace Ignition Coil

• Sub-steps:
  1. Using a multimeter, test the ignition coil resistance according to the manufacturer specifications.
  2. If the ignition coil is faulty, replace it with a new one.
  3. Reconnect the ignition coil and ensure it is securely mounted.

4. Inspect and Clean or Replace Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector on cylinder 1.
  2. Remove the fuel injector from the fuel rail (may require removing the rail depending on design).
  3. Inspect for clogs and clean using an ultrasonic cleaner or replace if necessary.
  4. Reinstall the injector ensuring proper sealing.

5. Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert a compression tester into the spark plug hole.
  3. Crank the engine and record the compression reading.
  4. Compare readings to manufacturer specification; if low, further engine diagnosis may be necessary.