how to resolve P0301 misfire code in Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

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

2. Replace Spark Plug

• Remove the ignition coil: Unbolt and disconnect the electrical connector from the ignition coil in cylinder 1.
• Remove the spark plug: Use a spark plug socket and ratchet to unscrew the spark plug from cylinder 1.
• Install new spark plug: Apply a small amount of anti-seize compound to the threads (if recommended) and torque to manufacturer's specifications (typically around 13-16 lb-ft).
• Reinstall ignition coil: Connect the coil back on the spark plug and secure it with the mounting bolt.

3. Replace Ignition Coil (if necessary)

• If the ignition coil was suspected to be faulty, remove it by unbolting and disconnecting the electrical connector.
• Install the new ignition coil by reversing the removal steps and ensuring it is securely fastened.

4. Replace Fuel Injector (if necessary)

• Remove the fuel rail if access to the injector is obstructed: Disconnect the fuel line and electrical connectors, and unbolt the rail.
• Remove the old fuel injector from cylinder 1 and install the new injector, ensuring it seats properly in the rail.
• Reinstall the fuel rail and connect all lines and connectors securely.

5. Final Assembly

• Reconnect the negative battery terminal.
• Start the engine and check for smooth operation and absence of check engine light.