how to fix the P0300 code in Toyota Camry XV70 (2018-2024)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plugs

• Sub-steps:

  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the ignition coil connectors.
  3. Unbolt and remove the ignition coils.
  4. Unscrew the spark plugs with a spark plug socket.
  5. Inspect old spark plugs for signs of wear or carbon buildup.
  6. Install new spark plugs, ensuring proper gap (0.043 inches) is set.
  7. Reinstall ignition coils and connectors.

• Tools Required:

  • Socket set
  • Spark plug socket
  • Torque wrench

3. Check and Replace Ignition Coils

• Sub-steps:

  1. Test each ignition coil with a multimeter (check for primary and secondary resistance).
  2. If any coil is out of specifications, remove and replace it.
  3. Install new coils and reconnect the wiring harnesses.

• Tools Required:

  • Multimeter
  • Socket set

4. Inspect Fuel System

• Sub-steps:

  1. Visually check for fuel line leaks.
  2. Remove the fuel pressure test port cap and attach a fuel pressure gauge.
  3. Turn the ignition key to the ON position (do not start the engine) and check the pressure.
  4. If pressure is low, check the fuel pump and filters for issues.
  5. Replace any faulty components as necessary.

• Tools Required:

  • Fuel pressure gauge
  • Wrench set

5. Reassemble and Reconnect Battery

• Sub-steps:
  1. Replace any engine covers removed during the process.
  2. Reconnect the negative battery terminal.
  3. Clear any previous fault codes using an OBD-II scanner.