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

Solution

1. Preparation

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

2. Inspect Ignition Components

• Spark Plugs:

  • Remove the spark plugs using a spark plug socket.
  • Inspect for signs of wear, fouling, or damage; replace if necessary.
  • Torque new spark plugs to manufacturer specifications (typically around 13-15 lb-ft).

• Ignition Coils:

  • Remove the ignition coil connectors and bolts.
  • Inspect for cracks or damage; replace if necessary.
  • Reinstall coils and connect the electrical connectors securely.

3. Check Fuel System

• Fuel Pressure:

  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the ON position (do not start the engine) and check pressure; it should meet specifications (typically between 40-50 psi).
  • If pressure is low, inspect the fuel pump and fuel filter for issues.

• Fuel Injectors:

  • Remove and inspect fuel injectors for clogs or leaks.
  • Clean or replace injectors as needed.

4. Inspect for Vacuum Leaks

• Visually inspect all vacuum hoses for cracks or disconnections.
• Use a smoke machine or spray carburetor cleaner around suspected areas to detect leaks.

5. Compression Test

• Remove spark plugs and perform a compression test using a compression gauge.
• Ensure that each cylinder has a compression reading within the manufacturer’s specifications (typically around 180 psi).

6. Reassemble and Clear Codes

• Reinstall all components in reverse order.
• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0300 code.