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

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, gap gauge.
• Remove the engine cover if applicable.
• Use the socket set to remove the spark plug from cylinder 1 (refer to the service manual for exact location).
• Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary.
• Ensure the new spark plug is gapped correctly according to manufacturer specifications.
• Install the spark plug by hand, then torque to the manufacturer’s specification using the torque wrench.

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Remove the ignition coil from cylinder 1 by unbolting it and disconnecting the electrical connector.
• Inspect the ignition coil for cracks or damage. Replace if necessary.
• Install the new ignition coil, ensuring the connector is securely attached and torque the bolts to specification.

4. Test and Clean Fuel Injector

• Tools Required: Fuel injector cleaner kit and multimeter.
• Remove the fuel injector from cylinder 1.
• Use the multimeter to check the resistance of the fuel injector; compare to manufacturer specifications.
• If faulty, replace the fuel injector. If it’s functional, clean it using a fuel injector cleaning kit.
• Reinstall the injector, ensuring it is seated properly.

5. Check for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner.
• Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a smoke machine to identify any vacuum leaks. If detected, replace the damaged hoses or seals.
• If using carburetor cleaner, spray around suspected leak areas and watch for RPM changes.