how to fix P0300 code in my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool.

2. Replace Spark Plugs

• Tools Required: Socket set, spark plug socket, torque wrench.
• Remove the ignition coil by unscrewing the bolts and gently pulling it out.
• Use a spark plug socket to remove the old spark plugs.
• Inspect the old spark plugs for signs of wear or damage.
• Install new spark plugs, ensuring to torque them to manufacturer specifications (typically around 13-16 lb-ft).
• Reinstall the ignition coils.

3. Inspect and Replace Ignition Coils (if necessary)

• Tools Required: Socket set, multimeter.
• Test each ignition coil with a multimeter for proper resistance (consult manufacturer specifications).
• If any ignition coil is faulty, remove it by unscrewing the bolts and disconnecting the electrical connector.
• Install the new ignition coil and secure it with bolts.

4. Clean or Replace Fuel Injectors

• Tools Required: Fuel pressure gauge, injector cleaning kit (if cleaning).
• Connect a fuel pressure gauge to the fuel rail and check for proper fuel pressure.
• If fuel pressure is low, check the fuel filter and replace if clogged.
• For cleaning, disconnect the fuel injectors and use a cleaning kit according to the manufacturer's instructions. Otherwise, replace faulty injectors.

5. Check for Vacuum Leaks

• Tools Required: Vacuum gauge or smoke machine.
• Inspect all vacuum lines visually for cracks or disconnections.
• Use a vacuum gauge to test for proper levels.
• Repair or replace any damaged vacuum lines.