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

Solution

1. Preparation

• Gather tools and parts needed for repairs.
• Disconnect the battery negative terminal to prevent electrical shorts.
• Allow the engine to cool before starting any work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, dielectric grease.
• Remove the ignition coil by unscrewing the bolts and disconnecting the wiring harness.
• Unscrew the spark plug using a spark plug socket.
• Inspect the spark plug gap and condition; replace if damaged or worn.
• Apply dielectric grease to the new spark plug threads and install it to the specified torque (typically 13-15 lb-ft).
• Reinstall the ignition coil.

3. Test Ignition Coil

• Tools Required: Multimeter.
• Disconnect the ignition coil connector.
• Set the multimeter to measure resistance and check the primary and secondary resistance of the coil. Compare readings to manufacturer specifications.
• Replace the ignition coil if readings are outside the specified range.

4. Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaning kit, safety goggles, gloves.
• Remove the fuel injector from cylinder 1 by disconnecting the fuel rail and unscrewing the injector.
• If cleaning, follow the instructions on the cleaning kit to ensure proper operation; otherwise, replace the injector with a new one.
• Reinstall the injector and ensure all connections are secure.

5. Check for Vacuum Leaks

• Inspect all vacuum lines connected to the intake manifold for cracks or disconnections.
• Replace any damaged hoses to ensure proper air-fuel mixture.