how to fix P0301 misfire code on 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.
• Gather necessary tools and parts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, plug gap tool.
• Remove the ignition coil by unbolting and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for damage or excessive wear. Replace if necessary. Ensure the gap is set to manufacturer specifications (typically 0.043 inches for Toyota).
• Install the new spark plug by hand-tightening and then torque to manufacturer specifications (usually around 13 lb-ft).
• Reinstall the ignition coil.

3. Check and Replace Ignition Coil

• If the spark plug is in good condition but the misfire persists, test the ignition coil.
• Disconnect the ignition coil and test it with an ohmmeter (check manufacturer specifications).
• If faulty, replace the ignition coil with a new one.
• Reconnect the coil and ensure it is seated properly.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit or replacement injector.
• Locate the fuel injector for cylinder 1 and disconnect the electrical connector.
• Remove the fuel rail if required to access the injector.
• Inspect the injector for clogs; if dirty, clean it using an appropriate cleaning kit or replace it.
• Reinstall the injector and reconnect all connections.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove spark plugs for all cylinders for accurate readings.
• Insert the compression tester into cylinder 1 and crank the engine.
• Record the compression reading and compare it to manufacturer specifications (typically around 170-200 psi).
• If compression is low, further diagnostics on the engine internals may be needed.