how to fix P0300 misfire code in Toyota Camry XV50 (2012-2017)

Solution

1. Preparation

• Gather tools and parts required.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plugs

• Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
• Extract the old spark plug using a socket wrench. Inspect the old plug for wear.
• Install new spark plugs, ensuring the gap is set to manufacturer specifications (typically around 0.043 inches).
• Reinstall the ignition coils and connect the electrical connectors securely.

3. Inspect and Replace Ignition Coils

• Visually inspect each ignition coil for damage or corrosion.
• If any coils are faulty, remove them by unscrewing and disconnecting.
• Replace with new ignition coils specific to the Camry XV50.
• Reconnect the electrical connectors and ensure they are secure.

4. Check Fuel System

• Connect a fuel pressure gauge to the fuel line and turn the ignition to the "ON" position without starting the engine.
• Verify that the fuel pressure matches the manufacturer's specifications (usually between 40-50 psi).
• If pressure is low, inspect the fuel pump, filter, and fuel lines for blockages or failures.

5. Inspect for Vacuum Leaks

• With the engine running, use a smoke machine or carburetor cleaner to check for vacuum leaks around intake gaskets, hoses, and throttle body.
• If a leak is found, replace the damaged hose or gasket.