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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent any electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil by unscrewing the bolts and disconnecting the electrical connector.
• Remove the spark plug using the spark plug socket.
• Inspect the old spark plug for wear; replace it with a new one if necessary.
• Torque the new spark plug to the manufacturer's specification (typically around 13-16 ft-lbs).
• Reinstall the ignition coil.

3. Test or Replace Ignition Coil

• If the ignition coil is suspected to be faulty, test it with a multimeter.
• Measure the primary and secondary resistance as per manufacturer specifications.
• If the coil fails the test, remove it and replace it with a new one.
• Reconnect the electrical connector and secure with bolts.

4. Clean or Replace Fuel Injector

• If the injector is clogged, use a fuel injector cleaning kit to clean it.
• If cleaning does not resolve the issue, remove the injector and replace it with a new one.
• Reinstall the fuel rail ensuring all seals are intact.

5. Perform Compression Test

• Insert a compression gauge into the spark plug hole of cylinder 1.
• Crank the engine and record the compression reading.
• If the reading is below specification (usually around 180-200 PSI), further diagnosis may be required for internal engine issues.