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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to avoid electrical shock.

2. Inspect Spark Plugs

• Sub-steps:
  1. Remove the engine cover if necessary using a socket set.
  2. Remove the spark plug wires or ignition coils to access the spark plugs.
  3. Inspect each spark plug for wear, carbon buildup, and gaps.
  4. Replace any damaged or worn spark plugs with OEM specifications.
  5. Reinstall ignition coils or spark plug wires securely.

3. Check Ignition Coils

• Sub-steps:
  1. Use a multimeter to test the resistance of each ignition coil.
  2. Replace any coils that are outside the manufacturer's resistance specifications.
  3. Reinstall the ignition coils ensuring they are seated correctly.

4. Fuel System Inspection

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (without starting the engine) to check the pressure reading.
  3. Compare the reading with manufacturer specifications; replace the fuel pump if necessary.
  4. Clean or replace fuel injectors if they are clogged or malfunctioning.

5. Air Intake System Check

• Sub-steps:
  1. Inspect the air filter and replace if dirty.
  2. Check for vacuum leaks in hoses connected to the intake manifold.
  3. Clean the throttle body if there is any carbon buildup.