how to fix a P0300 code in my Toyota RAV4 Fourth Generation (2013-2018)?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil cover if applicable.
• Use a spark plug socket to remove each spark plug.
• Inspect the spark plugs for wear or deposits. Replace any damaged plugs with OEM-equivalent plugs.
• Torque the new spark plugs to the manufacturer's specification (typically around 13-15 ft-lbs).

3. Test and Replace Ignition Coils

• Tools Required: Multimeter, socket set.
• Disconnect the electrical connector from each ignition coil.
• Use a multimeter to test the resistance of each coil. Compare readings against specifications in the service manual.
• Replace any faulty ignition coils with OEM parts.

4. Inspect Fuel System Components

• Tools Required: Fuel pressure gauge, basic hand tools.
• Connect a fuel pressure gauge to the fuel rail and turn the ignition to the "ON" position (do not start the engine).
• Check that the fuel pressure is within the specified range for the vehicle (usually around 40-50 psi).
• If pressure is low, inspect the fuel pump and fuel filter for clogs and replace as necessary.

5. Check for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner.
• Visually inspect all vacuum hoses for cracks or disconnections.
• Use a smoke machine to identify any vacuum leaks, or spray carburetor cleaner around suspected areas and listen for RPM changes.
• Repair or replace any faulty vacuum components.

6. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plugs and insert the compression tester into each cylinder.
• Crank the engine a few times and record the pressure readings.
• Compare the results to the manufacturer's specifications; replace any engine components if readings are significantly low and indicate internal damage.