how to fix P0300 code in Toyota Camry XV40 (2007-2011)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery cable.

2. Inspect and Replace Spark Plugs

• Remove the ignition coil cover if necessary.
• Disconnect the ignition coil connectors.
• Remove the ignition coils using a socket set.
• Extract the spark plugs with a spark plug socket.
• Inspect the spark plugs for wear or deposits; replace them if necessary.
• Install new spark plugs with a torque specification of 13 lb-ft (18 Nm).
• Reinstall the ignition coils, ensuring they are seated properly.

3. Check and Replace Ignition Coils

• Test each ignition coil with a multimeter for proper resistance (typically around 0.5-1.5 ohms for primary and 6,000-12,000 ohms for secondary).
• Replace any faulty ignition coils with OEM parts.
• Reassemble the ignition coil connectors and cover.

4. Inspect Fuel System

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (without starting the engine) to check fuel pressure. It should be around 40-50 psi.
• If pressure is low, consider replacing the fuel filter or fuel pump.

5. Check for Vacuum Leaks

• Start the engine and listen for hissing sounds that indicate vacuum leaks.
• Use a smoke machine or carburetor cleaner to find leaks. If found, replace damaged hoses or gaskets.