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

Solution

1. Preparation

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

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench, gap gauge.
• Remove the engine cover if applicable.
• Use a socket to remove the spark plug boots.
• Unscrew and remove the spark plugs using a spark plug socket.
• Check the gap on new spark plugs using a gap gauge; adjust if necessary.
• Install new spark plugs, tightening to manufacturer-recommended torque (typically 13-15 ft-lbs).
• Reattach the spark plug boots.

3. Inspect and Replace Ignition Coils

• Tools Required: Socket set, multimeter.
• Remove the ignition coil bolts using a socket.
• Carefully pull out the ignition coils; inspect for cracks or corrosion.
• Test the ignition coils with a multimeter for proper resistance (typically around 0.4-0.6 ohms).
• Replace any faulty ignition coils with new ones, securing with bolts.

4. Check and Replace Fuel Injectors (if necessary)

• Tools Required: Fuel pressure gauge, socket set, fuel injector puller.
• Relieve fuel pressure by removing the fuel pump relay and running the engine until it stalls.
• Disconnect fuel lines and electrical connectors from the injectors.
• Remove and replace any faulty fuel injectors, ensuring proper seating and connection.

5. Inspect for Vacuum Leaks

• Visually inspect all vacuum hoses and the intake manifold for cracks or loose connections.
• Use a smoke machine or carburetor cleaner to identify leaks.
• Replace any damaged hoses or re-secure connections as needed.