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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shock.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  • Remove the engine cover if necessary.
  • Disconnect the ignition coil connectors.
  • Remove the ignition coils using a socket set.
  • Unscrew and remove the old spark plugs using a spark plug socket.
  • Inspect the old spark plugs for wear (electrode erosion, oil fouling).
  • Install new spark plugs (torque to manufacturer specifications, typically 13-15 ft-lbs).
  • Reinstall ignition coils and connectors.

3. Check and Replace Ignition Coils (if necessary)

• Sub-steps:
  • If spark plugs are in good condition but misfires persist, test ignition coils using a multimeter.
  • Replace faulty ignition coils with new ones.
  • Reconnect the ignition coil connectors and ensure they are secured.

4. Inspect for Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses for cracks or disconnections.
  • Use propane or brake cleaner around intake areas while the engine is running to detect leaks.
  • Repair or replace any damaged hoses.

5. Fuel System Check

• Sub-steps:
  • Attach a fuel pressure gauge to the fuel rail.
  • Turn the ignition on without starting the engine to check pressure readings.
  • If pressure is low, inspect the fuel pump and fuel filter for issues; replace as needed.

6. Compression Test

• Sub-steps:
  • Remove the spark plugs again for access.
  • Insert the compression gauge into each cylinder.
  • Crank the engine and record the pressure readings for each cylinder.
  • If readings are significantly low, further investigate for internal engine issues.