how to resolve the P0301 misfire code on my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool completely before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil by unfastening the retaining bolts and disconnecting the electrical connector.
• Use the spark plug socket to remove the old spark plug from cylinder 1.
• Inspect the new spark plug for proper gap settings and install it into the cylinder head, tightening it to the manufacturer’s specified torque (typically around 13 lb-ft).
• Reattach the ignition coil and ensure all connections are secure.

3. Check and Replace Ignition Coil (if necessary)

• If the ignition coil tests faulty, remove it from the engine.
• Tools Required: Socket set.
• Install the new ignition coil, ensuring it is seated properly and fastened securely.

4. Inspect and Clean Fuel Injector (if necessary)

• If the fuel injector is malfunctioning, remove it from the engine.
• Tools Required: Fuel injector puller, cleaning solvent.
• Clean the injector with an appropriate cleaning solvent or replace it if cleaning does not resolve the issue.
• Reinstall the injector and ensure all connections are secure.

5. Verify Repair

• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature, checking for any abnormal sounds or behaviors.
• Clear any diagnostic trouble codes using an OBD-II scanner and monitor for reoccurrence.