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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Ignition Components

1. Remove Engine Cover (if applicable)
   • Use a socket set to remove bolts securing the engine cover.
2. Inspect Spark Plug
   • Remove the spark plug from cylinder 1 using a spark plug socket and ratchet.
   • Check for wear or damage; replace with a new OEM spark plug if necessary (Torque: 13 lb-ft).
3. Inspect Ignition Coil
   • Disconnect the ignition coil connector.
   • Remove the ignition coil from cylinder 1 with a socket set.
   • Test the coil with a multimeter to ensure it is functioning correctly. Replace if testing shows it is faulty.

3. Check and Replace Fuel Injector

1. Remove Fuel Injector
   • Relieve fuel pressure by removing the fuel pump fuse and starting the engine until it stalls.
   • Disconnect the fuel rail and remove the fuel injector from cylinder 1 using a socket set.
2. Test Fuel Injector
   • Use a fuel injector tester to check for proper operation; replace if it fails the test.

4. Perform Compression Test

1. Remove Spark Plug
   • Reuse the spark plug socket to remove the spark plug from cylinder 1 if not already done.
2. Install Compression Tester
   • Insert a compression tester into the spark plug hole and crank the engine for 5-10 seconds.
   • Record the reading and compare it to manufacturer specifications (typically around 150 psi for most engines). Replace if low compression is detected.

5. Reassemble and Reconnect

1. Reinstall Components
   • Reinstall the fuel injector, ignition coil, and spark plug in reverse order of removal.
   • Reattach the engine cover.
2. Reconnect Battery
   • Reconnect the battery terminals securely.