how to fix P0300 code on Toyota RAV4 Fifth Generation (2019-present)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface with the engine off.
• Disconnect the battery to ensure safety while working.

2. Inspect and Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil covers and disconnect the ignition coils.
• Remove the spark plugs using a spark plug socket.
• Inspect the spark plugs for wear; replace if necessary.
• Apply dielectric grease to the spark plug threads and install new spark plugs.
• Torque the spark plugs to manufacturer specifications (typically 13-16 lb-ft).

3. Examine and Replace Ignition Coils

• Tools Required: Socket set, torque wrench.
• Remove the ignition coil bolts and disconnect the electrical connectors.
• Inspect the ignition coils for cracks or damage; replace any faulty coils.
• Reinstall the ignition coils and torque to manufacturer specifications (typically 7-15 lb-ft).
• Reconnect the electrical connectors.

4. Clean or Replace Fuel Injectors

• Tools Required: Fuel injector cleaning kit, O-rings (if replacing).
• If cleaning, connect the fuel injector cleaning kit to the fuel rail and follow the manufacturer's instructions.
• If replacing, disconnect the fuel lines and electrical connectors from the injectors.
• Remove old injectors and replace them with new ones.
• Ensure O-rings are properly lubricated and seated before reinstallation.

5. Inspect Vacuum Lines

• Visually inspect all vacuum lines for cracks, disconnections, or damage.
• Replace any damaged lines with new vacuum hoses.

6. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0300 code and any other stored codes.