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

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the negative battery terminal to ensure safety while working on the vehicle.

2. Inspect and Replace Ignition Components

1. Remove Engine Cover: Unscrew and take off the engine cover to access ignition components.
2. Remove Spark Plug:
   • Use a spark plug socket to remove the spark plug from cylinder 1.
   • Inspect the spark plug for wear (carbon buildup, damage).
3. Replace Spark Plug:
   • Install a new spark plug (gapped according to specifications).
   • Torque the spark plug to manufacturer specifications (typically around 13 lb-ft).
4. Check Ignition Coil:
   • Remove the ignition coil from cylinder 1.
   • Inspect the coil for cracks or damage.
   • If faulty, replace the ignition coil with a new one and ensure it is seated properly.

3. Inspect and Replace Fuel Injector

1. Remove Fuel Injector Connector: Disconnect the electrical connector from the fuel injector for cylinder 1.
2. Remove Fuel Rail: If necessary, remove the fuel rail to access the injector. Be cautious of fuel spillage.
3. Replace Fuel Injector: Replace the fuel injector for cylinder 1 with a new one.
4. Reinstall Fuel Rail: Reattach the fuel rail and ensure all connections are secure.

4. Address Vacuum Leaks

1. Inspect Intake Manifold: Visually inspect the intake manifold gaskets for signs of damage or wear.
2. Use Smoke Test: If necessary, perform a smoke test to identify any vacuum leaks around the intake manifold and hoses.
3. Seal Leaks: Replace any damaged gaskets or hoses as needed.

5. Reassemble and Reconnect

• Reinstall the engine cover.
• Reconnect the negative battery terminal.