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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Fuel injector cleaner
• Multimeter

2. Replace Spark Plug

1. Remove the engine cover (if applicable).
2. Disconnect the ignition coil connector and remove the coil.
3. Use a spark plug socket to remove the spark plug.
4. Inspect the old spark plug for signs of wear or fouling.
5. Install the new spark plug and torque it to the manufacturer's specifications (typically 13-16 lb-ft).
6. Reattach the ignition coil and connector.

3. Test and Replace Ignition Coil (if necessary)

1. Swap the ignition coil from cylinder 1 with another cylinder (e.g., cylinder 2).
2. Clear the codes using the OBD-II scanner.
3. Start the engine and check for any new misfire codes.
4. If the P0301 code reappears, replace the ignition coil with a new one.

4. Inspect Fuel Injector

1. Remove the fuel rail bolts and carefully pull the fuel rail away from the engine.
2. Remove the injector for cylinder 1.
3. Clean the injector using fuel injector cleaner or replace it if it's clogged.
4. Reinstall the injector and ensure it is seated properly in the fuel rail.

5. Perform Compression Test

1. Remove the spark plug for cylinder 1 again.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine and record the compression reading.
4. Compare with the manufacturer's specifications (typically 180-200 psi).
5. If compression is low, inspect for valve issues, piston damage, or head gasket failure.