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

Solution

1. Preparation

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

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover (if applicable) to access the spark plugs.
• Use the spark plug socket to carefully remove each spark plug.
• Inspect the old spark plugs for signs of wear, such as carbon buildup or damage.
• Install new spark plugs (ensure they are the correct type and gap) and torque to manufacturer specifications (typically around 13 lb-ft for Toyota).
• Reinstall the engine cover.

3. Replace Ignition Coils

• Tools Required: Socket set, torque wrench.
• Disconnect the electrical connector from each ignition coil.
• Remove the bolts securing the ignition coils and pull them out.
• Install new ignition coils and secure them with bolts to the manufacturer's torque specifications (typically around 7 lb-ft).
• Reconnect the electrical connectors.

4. Check and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner, cleaning kit (if needed), safety goggles.
• Remove fuel injectors from the fuel rail (ensure fuel pressure is relieved prior).
• Use a fuel injector cleaner to clean each injector or replace them if they are clogged or damaged.
• Reinstall the fuel injectors making sure they are seated correctly.

5. Final Checks

• Reconnect the negative battery terminal.
• Start the engine and let it idle for a few minutes to ensure the repairs are functioning correctly.