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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, fuel injector cleaning kit.
• Gather necessary parts (spark plugs, ignition coil, fuel injector) based on diagnostic findings.
• Ensure the vehicle is parked on a flat surface and the engine is cool.

2. Replace Spark Plug

• Sub-steps:
  1. Disconnect the negative battery terminal to prevent electrical shock.
  2. Remove the engine cover if necessary.
  3. Carefully detach the ignition coil connector from the ignition coil of cylinder 1.
  4. Remove the ignition coil using a socket wrench.
  5. Unscrew the old spark plug with a spark plug socket.
  6. Inspect the spark plug gap and condition; replace if worn or fouled.
  7. Install a new spark plug, ensuring it is torqued to the manufacturer's specification (typically around 13 lb-ft).
  8. Reinstall the ignition coil and reconnect the connector.

3. Test and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. Using a multimeter, check the resistance of the ignition coil. Refer to the specifications for your vehicle (typically between 0.5-1.5 ohms).
  2. If the ignition coil is faulty, replace it with a new one, ensuring to torque it to the recommended specification.
  3. Reconnect the ignition coil and ensure all connections are secure.

4. Inspect and Clean Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector.
  2. Remove the fuel injector from cylinder 1 using appropriate tools.
  3. Clean the injector using a fuel injector cleaning kit or replace it if it’s clogged or damaged.
  4. Reinstall the fuel injector, ensuring it is seated correctly and reconnect the connector.

5. Compression Test (if misfire persists)

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine to obtain a compression reading. Record the reading.
  4. Compare with specifications (should typically be around 180-200 psi).
  5. If compression is low, further investigation into piston rings or valves may be necessary.