how to fix the P0301 misfire code in my Toyota RAV4 Fifth Generation (2019-present)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shock.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts and disconnecting the electrical connector.
• Unscrew the old spark plug using a spark plug socket and ratchet.
• Check the gap on the new spark plug according to the specifications (typically around 0.043 inches).
• Install the new spark plug and torque it to the manufacturer’s specification (usually around 13 ft-lbs).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

• If the ignition coil was found to be faulty during diagnostics, remove the old coil from cylinder 1.
• Install the new ignition coil and secure it with bolts, ensuring proper connection of the electrical connector.

4. Inspect and Replace Fuel Injector (if necessary)

• If the fuel injector was found to be faulty, remove it from cylinder 1.
• Install the new fuel injector, ensuring it seats properly in the intake manifold.
• Reconnect the fuel line and electrical connector to the new injector.

5. Reassemble and Final Checks

• Reconnect the battery terminals securely.
• Clear the trouble codes using an OBD-II scanner and start the engine.
• Monitor for any abnormalities or check engine light re-illumination.