why does my Toyota Camry XV70 (2018-2024) have a check engine light and code P0300?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface with the engine off and cool.
• Disconnect the negative battery terminal to prevent electric shock.

2. Inspect and Replace Spark Plugs

• Remove the ignition coils using a socket set.
• Take out the spark plugs with a spark plug socket and inspect them for wear or damage.
• Replace any worn or damaged spark plugs with new OEM-spec spark plugs.
• Reinstall the spark plugs and ignition coils, ensuring they are securely fastened.

3. Check and Replace Ignition Coils (if necessary)

• If the ignition coils show signs of damage or wear, replace them.
• Disconnect the electrical connectors and remove the ignition coils.
• Install new ignition coils, ensuring proper alignment and connection.

4. Inspect Fuel Injectors

• Check the fuel injectors for proper operation, ensuring they are clean and free of debris.
• Use a fuel injector cleaner if necessary or replace faulty injectors.

5. Test and Repair Vacuum Leaks

• Inspect all vacuum hoses and the intake manifold for leaks.
• Replace any damaged hoses and ensure all connections are tight.
• Use a smoke machine if available to detect hard-to-find leaks.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0300 code.
• Start the engine and allow it to idle, monitoring for any reoccurrence of the check engine light.