how to fix P0300 random misfire code on Toyota Tacoma N300 (2016-Present)?

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool if it has been running.

2. Replace Spark Plugs

1. Remove engine cover (if applicable) using a socket set.
2. Disconnect the ignition coil connectors.
3. Remove the ignition coils using a socket wrench.
4. Use a spark plug socket to remove old spark plugs.
5. Inspect the spark plug gap and adjust or replace as needed.
6. Install new spark plugs and torque them to manufacturer's specifications (typically between 13-15 ft-lbs).
7. Reinstall the ignition coils and reconnect the connectors.

3. Inspect and Replace Ignition Coils

1. If faulty ignition coils were identified, remove them as previously described.
2. Install new ignition coils and ensure they are seated properly.
3. Reconnect the ignition coil connectors.

4. Check Fuel Injectors

1. Using a fuel pressure gauge, connect it to the fuel rail and turn the ignition to the ON position (do not start the engine) to check for proper fuel pressure (consult specifications for the correct pressure).
2. If pressure is low, inspect the fuel filter and pump for issues; replace if necessary.
3. If injectors are clogged, use a fuel injector cleaning kit or replace the injectors if necessary.

5. Inspect Vacuum Lines and Intake

1. Visually inspect all vacuum lines for cracks or disconnections.
2. Use a smoke machine to detect vacuum leaks if necessary.
3. Repair or replace any damaged vacuum lines and ensure all connections are secure.