how to fix P0301 misfire code in Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative terminal of the battery.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench, anti-seize compound.
• Remove the ignition coil from cylinder 1.
• Unscrew the old spark plug using a spark plug socket.
• Inspect the spark plug for wear and replace it with a new one, ensuring the gap is set to the manufacturer's specifications (typically around 0.043 inches for Toyota).
• Apply anti-seize compound to the threads of the new spark plug.
• Torque the new spark plug to the manufacturer's specifications (usually around 13 lb-ft).
• Reinstall the ignition coil.

3. Replace Ignition Coil (if necessary)

• Tools Required: Ratchet, socket set.
• If the ignition coil tested faulty, remove it from cylinder 1.
• Install the new ignition coil, ensuring it is seated correctly.
• Reconnect the electrical connector for the ignition coil.

4. Clean or Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector cleaning kit or replacement fuel injector.
• If the fuel injector is clogged, clean it using a fuel injector cleaning kit or replace it with a new one.
• Reinstall the fuel rail and ensure all connections are secure.

5. Perform a Compression Test (if necessary)

• Tools Required: Compression tester.
• Remove the spark plug and ignition coil from cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine.
• Record the compression reading and compare it to specifications (usually around 180 psi for most Toyota engines).
• If the reading is below specifications, further investigation may be needed for internal engine issues.