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

Solution

1. Preparation

• Gather tools and parts required for repair.
• Disconnect the negative terminal of the battery to ensure safety.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1.
• Remove the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for wear or damage; replace if necessary.
• Install the new spark plug to a torque specification of 13 lb-ft (17.5 Nm).

3. Check and Replace Ignition Coil

• If the spark plug is fine, test the ignition coil with a multimeter for resistance.
• If it’s out of specification, remove the ignition coil from cylinder 1.
• Replace it with a new ignition coil and ensure it is seated correctly.

4. Test Fuel Injector

• Remove the fuel injector connector for cylinder 1.
• Use a noid light or multimeter to check for electrical signal to the injector.
• If no signal is present, inspect the wiring and connections.
• If the injector is faulty, remove and replace it with a new one.

5. Compression Test

• If misfire persists, perform a compression test on cylinder 1.
• If compression is low, further diagnostics may be necessary to check for internal engine issues (valve problems, piston rings).

6. Clear Codes and Reconnect Battery

• Reconnect the battery terminal.
• Use the OBD-II scanner to clear the P0301 error code.
• Start the engine and monitor for any reoccurrence of the code.