how to fix P0300 code on my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Spark Plugs

• Remove the ignition coil cover if applicable.
• Disconnect the ignition coil connectors and remove the coils using a socket set.
• Remove the spark plugs using a spark plug socket.
• Inspect the spark plugs for wear or fouling; replace if damaged.
• Install new spark plugs, ensuring the correct gap (usually 0.043 inches for RAV4).
• Reinstall the ignition coils and connectors securely.

3. Check and Replace Ignition Coils

• Using a multimeter, test the primary and secondary resistance of each ignition coil.
• If a coil fails the test, replace it with a new one.
• Reconnect all ignition coils after replacement.

4. Inspect Fuel Injectors

• Remove the fuel injector connectors and fuel rail if needed.
• Check for clogs using a fuel pressure gauge; replace any faulty injectors.
• Clean injectors if they are dirty and reinstall them securely.

5. Vacuum Leak Test

• Start the engine and use carburetor cleaner around intake gaskets and hoses.
• Listen for changes in engine RPM, indicating a vacuum leak.
• Repair or replace any damaged hoses or gaskets.

6. Compression Test

• Remove spark plugs and perform a compression test on each cylinder.
• Ensure the compression is within the manufacturer’s specifications (typically around 180 psi).
• Address any cylinders with low compression through necessary repairs.