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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety during the repair process.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug

1. Remove the engine cover if applicable.
2. Locate and remove the ignition coil from cylinder 1.
   • Tools Required: Ratchet and socket set, extension.
3. Remove the spark plug using a spark plug socket.
4. Inspect the old spark plug for wear; replace if necessary.
5. Install the new spark plug, ensuring the gap is set to the manufacturer’s specifications.
6. Reinstall the ignition coil, tightening to the specified torque (around 7 ft-lbs).

3. Inspect Fuel Injector

1. Locate the fuel injector for cylinder 1.
2. Disconnect the electrical connector from the fuel injector.
3. Use a multimeter to check the resistance of the injector (should be within manufacturer's specifications).
4. If faulty, replace the fuel injector:
   • Remove the fuel rail if necessary.
   • Install the new fuel injector and reconnect the electrical connector.

4. Check Compression

1. Remove the spark plug from cylinder 1 again.
2. Insert a compression gauge into the spark plug hole.
3. Crank the engine to get a compression reading.
   • Compare the reading to specifications (typically around 180-200 psi).
4. If compression is low, further investigation into internal engine components may be necessary.

5. Reassemble and Clear Codes

1. Reinstall any components removed for access.
2. Reconnect the negative battery terminal.
3. Use the OBD-II scanner to clear the P0301 code from the vehicle's computer.