how to fix P0301 misfire code in Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical short circuits during repairs.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1 by unbolting and disconnecting the electrical connector.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for wear. If it is worn or fouled, replace it with a new spark plug, ensuring the gap is set according to manufacturer specifications.
• Reinstall the spark plug and torque it to the manufacturer's specified torque (typically around 13-16 lb-ft for most Toyota spark plugs).
• Reattach the ignition coil, ensuring the connector is secure.

3. Inspect and Replace Ignition Coil (if necessary)

• If the spark plug is in good condition but the misfire persists, proceed to the ignition coil.
• Remove the ignition coil from cylinder 1.
• Install a new ignition coil and reconnect the electrical connector securely.

4. Check and Clean Fuel Injector

• If the ignition system is functioning correctly, check the fuel injector.
• Remove the fuel injector from cylinder 1.
• Clean the injector using a suitable fuel injector cleaner or replace it if it is clogged or damaged.
• Reinstall the fuel injector, ensuring it is seated properly.

5. Check Compression (if still misfiring)

• Use a compression tester to check the compression in cylinder 1.
• If the compression is below specifications, further inspection of the engine (valves, piston rings) may be necessary.