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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Fuel pressure gauge
• Multimeter

2. Inspect and Replace Spark Plugs

• Remove the engine cover (if applicable) to access spark plugs.
• Using a socket wrench, remove the spark plugs from the cylinder head.
• Inspect the spark plugs for signs of wear or damage, and replace them if necessary.
  • Torque value for installation: 13 lb-ft (18 Nm).
• Reinstall the spark plugs and reconnect the ignition coils.

3. Check and Replace Ignition Coils

• Use a multimeter to test each ignition coil for proper resistance. Compare readings to the specifications in the service manual.
• If any ignition coils are faulty, remove the screws holding the coil in place, disconnect the electrical connector, and replace the coil.
• Reinstall the new ignition coils and reconnect the battery.

4. Inspect and Clean Fuel Injectors

• Remove the fuel rail to access the injectors.
• Inspect fuel injectors for clogs; clean them using a fuel injector cleaner if necessary.
• Replace any injectors that are damaged or leaking.

5. Test Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Start the engine and check the fuel pressure against manufacturer specifications.
• If pressure is below specifications, inspect the fuel pump and fuel filter for issues.

6. Check for Vacuum Leaks

• Inspect all vacuum lines for cracks or loose connections.
• Use a smoke machine or carburetor cleaner to identify and repair any vacuum leaks.