how to fix P0300 code on Toyota RAV4 Fourth Generation (2013-2018)?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down before starting work.

2. Replace Spark Plugs

• Remove the engine cover if applicable.
• Using a socket set, unscrew and remove the spark plugs from the engine.
• Inspect the old spark plugs for wear patterns and replace with new ones, ensuring the gap is set to manufacturer specifications (typically around 0.043 inches).
• Torque the new spark plugs to the manufacturer's specification (around 13 lb-ft usually).

3. Inspect and Replace Ignition Coils

• Remove the bolts securing the ignition coils using a socket set.
• Carefully pull the ignition coils out of their respective cylinders.
• Test each coil with a multimeter for proper resistance (typically between 0.4 to 2.0 ohms).
• Replace any faulty ignition coils with new ones and secure them.

4. Check and Clean Fuel Injectors

• Disconnect the fuel injector electrical connectors.
• Remove the fuel rail by loosening the bolts.
• Carefully pull out the fuel injectors.
• Inspect the injectors for clogs and clean them using a fuel injector cleaner or replace them if necessary.
• Reinstall the injectors and fuel rail, ensuring all connections are secure.

5. Inspect Vacuum Hoses

• Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Replace any damaged hoses with new ones, ensuring a tight fit to prevent air leaks.

6. Clean or Replace MAF Sensor

• Locate the MAF sensor in the air intake system.
• Disconnect the electrical connector and remove the sensor.
• Clean the MAF sensor with MAF cleaner spray or replace it if cleaning does not improve performance.
• Reinstall the sensor and reconnect the electrical connector.