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

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, multimeter, fuel pressure gauge, vacuum gauge.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal for safety.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the ignition coil covers (if applicable) using a socket set.
  2. Disconnect the electrical connector from each ignition coil.
  3. Remove the ignition coils using a socket set.
  4. Remove the spark plugs using a spark plug socket.
  5. Inspect old spark plugs for wear; replace if necessary with OEM specification spark plugs, ensuring correct torque (typically around 13 lb-ft).
  6. Reinstall the ignition coils and their connectors.

3. Check and Replace Ignition Coils

• Sub-steps:
  1. If the spark plugs are in good condition, use a multimeter to check the resistance of each ignition coil.
  2. Replace any faulty ignition coils with new OEM coils.
  3. Reconnect all electrical connectors securely.

4. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the fuel injector connectors.
  2. Use a fuel pressure gauge to check for proper fuel pressure; refer to manufacturer specifications.
  3. Clean or replace any faulty fuel injectors as required.
  4. Reconnect the fuel injector connectors.

5. Inspect Air Intake and Vacuum Lines

• Sub-steps:
  1. Visually inspect the air intake system for cracks or loose connections.
  2. Check all vacuum lines for leaks or damage.
  3. Replace any damaged components as needed.
  4. Ensure the air filter is clean and properly installed.

6. Engine Compression Test

• Sub-steps:
  1. Remove spark plugs again to facilitate compression testing.
  2. Insert a compression gauge into the spark plug hole of each cylinder.
  3. Crank the engine and record the compression readings.
  4. Compare results to specifications; replace engine components if compression is low.