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

Solution

1. Preparation

• Gather tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Ignition Components

• Spark Plugs:

  • Remove the ignition coil covers (if applicable) using a socket set.
  • Remove spark plugs using a spark plug socket and inspect for wear or fouling.
  • Replace with OEM or high-quality spark plugs, ensuring to torque to manufacturer specifications (usually around 13-15 ft-lbs).

• Ignition Coils:

  • If spark plugs are in good condition, test the ignition coils using a multimeter.
  • Replace any faulty ignition coils with OEM parts, ensuring proper seating and connection.

3. Check and Clean Fuel Injectors

• Fuel Injector Inspection:
  • Disconnect the fuel injector harness and remove the fuel rail (ensure to relieve fuel pressure first).
  • Inspect injectors for clogs; use a fuel injector cleaning kit if necessary.
  • Replace any faulty injectors with OEM or high-quality replacements.

4. Address Vacuum Leaks

• Inspect Hoses:
  • Visually inspect all vacuum hoses for cracks or disconnections.
  • Replace any damaged hoses and ensure all connections are secure.

5. Engine Compression Test

• Compression Test:
  • Remove spark plugs.
  • Insert a compression gauge into each cylinder and crank the engine.
  • Compare readings against manufacturer specifications (usually around 180-220 psi).
  • If compression is low in any cylinder, further investigation into engine internals may be required.