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

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, replacement spark plug, ignition coil (if needed), fuel injector cleaner.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

1. Remove Ignition Coil:

   • Unplug the connector from the ignition coil.
   • Remove the bolts holding the ignition coil in place using a socket set.
   • Carefully pull the ignition coil out.

2. Remove Spark Plug:

   • Use a spark plug socket to remove the spark plug from cylinder 1.
   • Inspect the spark plug for wear or damage; replace if necessary.

3. Install New Spark Plug:

   • Gap the new spark plug to manufacturer specifications.
   • Install the new spark plug and torque to the manufacturer’s specs (usually around 13-16 ft-lbs).

4. Reinstall Ignition Coil:

   • Place the ignition coil back and secure it with bolts.
   • Reconnect the coil’s electrical connector.

3. Inspect and Replace Ignition Coil (if needed)

1. Testing the Ignition Coil:

   • Use a multimeter to check the resistance of the ignition coil; compare it to specifications (usually around 0.5-2.0 ohms for primary and 6,000-15,000 ohms for secondary).
   • If the coil fails the test, proceed to replace it.

2. Install New Ignition Coil:

   • Follow the removal steps in the previous section to install the new ignition coil.

4. Check Fuel Injector

1. Inspect Fuel Injector:

   • Remove the fuel injector connector and inspect for damage.
   • Perform a resistance test on the injector with a multimeter (specifications may vary; generally around 12-16 ohms).

2. Clean or Replace Fuel Injector:

   • If the injector is clogged, use a fuel injector cleaning kit or replace the injector if faulty.

5. Reconnect Battery

• Reconnect the negative battery terminal and ensure all tools are removed from the engine bay.