how to fix P0301 misfire code in my Toyota RAV4 XA40 (2013-2018)?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil from cylinder 1 by unbolting it and disconnecting the electrical connector.
• Use a spark plug socket to remove the old spark plug from cylinder 1.
• Inspect the new spark plug for proper gap settings according to the manufacturer’s specifications (typically around 0.043 inches for Toyota).
• Apply a small amount of dielectric grease to the threads of the new spark plug and install it, tightening it to the specified torque (usually around 13 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

• If the ignition coil was found defective during diagnostics, remove the faulty coil from cylinder 1.
• Install the new ignition coil in the same position and secure it with the bolt.
• Reconnect the electrical connector to the ignition coil.

4. Inspect/Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector removal tool, socket set.
• Disconnect the fuel injector connector and remove the fuel rail bolts.
• Carefully pull the fuel rail with the injector off the engine, taking care not to damage any seals.
• Replace the fuel injector for cylinder 1 if it was found to be faulty during diagnostics.
• Reinstall the fuel rail and reconnect the fuel injector and fuel rail bolts, ensuring proper sealing.