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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector and remove the ignition coil.
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for wear (carbon buildup, electrode wear).
• Replace the spark plug with a new one, ensuring it is gapped correctly.
• Torque the spark plug to the manufacturer's specifications (typically around 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

• Reinstall the ignition coil if it appears to be in good condition; otherwise:
• Tools Required: Socket set, torque wrench.
• Remove the ignition coil from cylinder 1.
• Install a new ignition coil, ensuring it clicks into place.
• Torque the ignition coil mounting bolt to the manufacturer's specifications.

4. Check Fuel Injector

• Tools Required: Fuel injector cleaner or multimeter (for testing).
• Disconnect the fuel injector connector on cylinder 1.
• Use a multimeter to check the resistance of the fuel injector; replace if out of specifications.
• If cleaning, use a fuel injector cleaner and follow the manufacturer's instructions.

5. Reassemble and Test

• Reconnect all components, ensuring all connectors are secure.
• Reconnect the negative battery terminal.
• Start the engine and check for any leaks or unusual noises.