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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the ignition coil cover (if applicable) using a socket set.
  2. Disconnect the electrical connectors from the ignition coils.
  3. Remove the ignition coils using a socket wrench.
  4. Remove the spark plugs using a spark plug socket.
  5. Inspect the spark plugs for wear; replace them if they appear worn or fouled.
  6. Install new spark plugs to the manufacturer's torque specifications (typically around 13-15 lb-ft).
  7. Reinstall the ignition coils and reconnect the electrical connectors.

3. Inspect and Replace Ignition Coils (if necessary)

• Sub-steps:
  1. Check the ignition coils for cracks or signs of failure.
  2. If any ignition coil is defective, remove and replace it with a new one.
  3. Ensure that the new coils are properly seated and connected.

4. Fuel System Inspection and Cleaning

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Start the engine and monitor fuel pressure; it should match the specifications (typically around 40-50 psi).
  3. If pressure is low, check the fuel pump and replace if necessary.
  4. Use fuel injector cleaner and run the engine to clean the injectors if they are functioning but showing signs of clogging.

5. Vacuum System Inspection

• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks or disconnections.
  2. Replace any damaged hoses.
  3. Use a smoke machine to detect leaks if necessary.

6. Air Intake System Inspection

• Sub-steps:
  1. Check the air filter for cleanliness; replace it if dirty.
  2. Inspect the intake manifold for any leaks or damage.
  3. Ensure the Mass Air Flow (MAF) sensor is clean and functioning.