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

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the negative battery terminal to prevent any electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts.
• Carefully pull the ignition coil out of the spark plug well.
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for signs of wear, carbon buildup, or damage. Replace with OEM specifications (usually around 0.044" gap).
• Install the new spark plug and torque to manufacturer specifications (usually 13 lb-ft).
• Reinstall the ignition coil and secure with bolts.

3. Test and Replace Ignition Coil (if necessary)

• Tools Required: Multimeter, socket set
• Using a multimeter, check the primary and secondary resistance of the ignition coil. Compare results with OEM specifications.
• If the coil is faulty, remove the old ignition coil and replace it with a new one.
• Reinstall and secure the ignition coil.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit (if needed), socket set
• Remove the fuel rail (if applicable) to access the fuel injector for cylinder 1.
• Inspect the fuel injector for clogs or leaks.
• Clean the injector using a fuel injector cleaning kit or replace it with a new one if necessary.
• Reassemble the fuel rail and ensure all connections are secure.

5. Perform Compression Test (if needed)

• Tools Required: Compression tester
• Remove the spark plug from cylinder 1 and install the compression tester.
• Crank the engine several times and record the compression reading.
• Compare the reading to manufacturer specifications (usually around 180-200 psi). If low, further diagnosis may be required.