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

Solution

1. Preparation

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

2. Replace Spark Plugs

• Remove the ignition coil cover (if applicable) using a socket set.
• Disconnect the electrical connectors from the ignition coils.
• Remove the ignition coils using a socket wrench.
• Unscrew the spark plugs with a spark plug socket and ratchet.
• Install new spark plugs, ensuring they are gapped correctly (typically 0.044 inches for Toyota).
• Reinstall ignition coils and reconnect electrical connectors.

3. Test and Replace Ignition Coils (if necessary)

• Using a multimeter, check each ignition coil's primary and secondary resistance according to specifications (refer to service manual).
• If any coils are out of specification, replace them with new ones.
• Reinstall the ignition coils after replacement.

4. Inspect and Repair Vacuum Leaks

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

5. Check Fuel System

• Connect a fuel pressure gauge to the fuel rail to measure fuel pressure.
• Ensure the pressure is within the manufacturer’s specifications (typically 40-50 psi for Toyota).
• If fuel pressure is low, inspect the fuel pump and replace if necessary.