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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.
• Ensure the engine is cool before starting work.

2. Inspect and Replace Spark Plugs

• Remove the ignition coil covers using a socket set.
• Unplug the ignition coils from the spark plugs.
• Use a spark plug socket to remove the spark plugs.
• Inspect the spark plugs for wear; replace with OEM plugs if damaged or worn.
• Torque the new spark plugs to manufacturer specifications (typically around 13 lb-ft).

3. Test and Replace Ignition Coils if Necessary

• Use a multimeter to check the resistance of each ignition coil (should be within manufacturer's specifications).
• If any coil is out of spec, replace it with an OEM part.
• Reinstall ignition coils and reconnect the connectors securely.

4. Clean or Replace Fuel Injectors

• Remove the fuel rail to access the fuel injectors.
• Inspect the injectors for clogs; use a fuel injector cleaner if they appear dirty.
• If cleaning does not resolve the issue, replace the injectors with OEM parts.
• Reinstall the fuel rail and ensure all connections are secure.

5. Check for Vacuum Leaks

• Inspect all vacuum hoses and connections visually.
• Conduct a smoke test if necessary to identify hard-to-find leaks.
• Repair or replace any damaged hoses.

6. Final Assembly and Testing

• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.
• Check for any remaining error codes using the OBD-II scanner.