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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Inspect the old spark plug for signs of damage, carbon buildup, or excessive wear.
• Apply anti-seize compound on the threads of the new spark plug.
• Install the new spark plug to the manufacturer's specified torque (usually around 13 lb-ft).
• Reinstall the engine cover if applicable.

3. Inspect and Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil on cylinder 1.
• Remove the mounting bolt(s) securing the ignition coil and extract it from the cylinder head.
• Inspect the ignition coil for cracks or corrosion.
• Install the new ignition coil and secure it with the mounting bolt(s) to the manufacturer's torque specifications.
• Reconnect the electrical connector.

4. Check and Clean Fuel Injector

• Remove the fuel injector connector from cylinder 1.
• Use a fuel injector cleaning kit to ensure proper operation.
• If necessary, replace the fuel injector, ensuring to use new O-rings.
• Reinstall the connector once cleaning or replacement is complete.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the fault codes from the vehicle's computer.