how to fix P0300 misfire code on Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plugs

• Remove the ignition coil covers if applicable.
• Use a spark plug socket to remove the spark plugs.
• Inspect the plugs for signs of wear, carbon buildup, or oil fouling.
• Replace with new spark plugs (OEM specifications recommended).
• Torque the spark plugs to the manufacturer’s specification (typically around 13-16 lb-ft).

3. Check and Replace Ignition Coils

• Remove the ignition coils from the spark plugs.
• Use a multimeter to check the resistance of each coil (consult the service manual for specific values).
• Replace any faulty ignition coils with new ones (OEM recommended).
• Reinstall ignition coils and ensure they are seated properly.

4. Inspect and Clean Fuel Injectors

• If injectors are suspected to be clogged, remove them using a fuel injector removal tool.
• Clean the injectors with a professional cleaning kit or replace if heavily clogged.
• Reinstall the injectors ensuring proper sealing.

5. Check for Vacuum Leaks

• Inspect all vacuum hoses for cracks or disconnections.
• Replace any damaged hoses.
• If using a smoke machine, introduce smoke to the intake system and look for leaks.

6. Test Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position without starting the engine to check the pressure.
• Ensure the fuel pressure is within the specified range (consult the service manual).
• If pressure is low, check the fuel pump and filter for issues.