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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plugs

• Remove the engine cover if necessary (use a socket set).
• Disconnect ignition coil connectors and remove the coils (usually secured by bolts).
• Remove spark plugs using a spark plug socket; inspect for wear or damage.
• Install new spark plugs, ensuring the gap is set to the manufacturer’s specifications (usually around 0.043 inches).
• Reinstall ignition coils and connectors securely.

3. Inspect and Test Ignition Coils

• If misfire persists, swap suspected faulty ignition coils with known good ones.
• Test each coil for resistance using a multimeter, checking against manufacturer specifications.
• Replace any faulty ignition coils.

4. Clean or Replace Fuel Injectors

• If injectors are suspected to be clogged, use a fuel injector cleaning kit to clean them.
• Alternatively, replace any malfunctioning fuel injectors.

5. Check for Vacuum Leaks

• Visually inspect all vacuum hoses for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to check for leaks around the intake manifold.
• Repair or replace any damaged hoses.

6. Test Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the ON position (without starting the engine) and check the pressure reading.
• Compare the reading to the manufacturer’s specifications (typically between 40-50 PSI).
• If pressure is low, inspect the fuel pump and fuel filter for issues.