how to resolve P0301 misfire code in my Toyota RAV4 XA50 (2019-2024)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery cable to prevent electrical shorts.
• Allow the engine to cool if it has been running.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap gauge
• Remove the ignition coil for cylinder 1 by unscrewing any retaining bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the old spark plug for signs of wear or fouling.
• Install a new spark plug with the correct gap (refer to the owner’s manual for specifications) and torque it to the manufacturer’s specification (usually around 13-16 lb-ft).
• Reattach the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

• If the ignition coil shows signs of damage or failure, remove it and replace it with a new one.
• Ensure the new coil is seated properly and reattach any bolts and connectors.

4. Fuel Injector Cleaning/Replacement

• If the fuel injector is faulty, it may need cleaning or replacement.
• Disconnect the fuel line (use a fuel line tool if necessary) and electrical connector from the injector.
• Remove the injector from the rail and clean it using an appropriate fuel injector cleaner or replace it with a new one.
• Reinstall the injector and reconnect the fuel line and electrical connector.

5. Reassemble and Test

• Reconnect the negative battery cable.
• Start the engine and verify that the misfire has been resolved.
• Monitor for any check engine light illumination after the repair.