how to fix P0300 code in Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather all required tools and parts.
• Ensure the vehicle is parked on a level surface, and the engine is off and cool.

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if necessary.
• Disconnect the ignition coils from the spark plugs.
• Use a socket to remove the old spark plugs.
• Inspect the threads for damage; clean if necessary.
• Install new spark plugs hand-tight, then torque to 13 lb-ft (17.6 Nm).

3. Inspect and Replace Ignition Coils

• Tools Required: Socket set.
• Remove the ignition coils by unbolting them and disconnecting the electrical connectors.
• Inspect for cracks or wear; replace any faulty coils with new ones.
• Reinstall the ignition coils and reconnect the electrical connectors securely.

4. Check and Repair Fuel System

• Tools Required: Fuel pressure gauge.
• Attach the fuel pressure gauge to the fuel rail.
• Turn the ignition key to the "ON" position to check the pressure; it should be within the manufacturer’s specifications (about 43-50 psi).
• If the pressure is low, inspect and replace the fuel filter or fuel pump as needed.

5. Inspect for Vacuum Leaks

• Tools Required: Vacuum gauge or carburetor cleaner.
• Visually inspect all vacuum hoses connected to the intake manifold.
• Use a vacuum gauge to check for proper readings and identify any leaks.
• If leaks are found, replace the affected hoses or gaskets.