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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Replace Spark Plugs

• Tools Required: Spark plug socket, ratchet, torque wrench
  • Remove the ignition coil covers if applicable.
  • Disconnect the ignition coils from the spark plugs.
  • Use a spark plug socket to remove the old spark plugs.
  • Inspect the old spark plugs for wear; replace with new ones if necessary.
  • Install the new spark plugs, ensuring to torque them to the manufacturer's specification (usually around 13-16 lb-ft).
  • Reconnect the ignition coils.

3. Inspect and Replace Ignition Coils (if necessary)

• Tools Required: Socket set
  • Remove the ignition coils by unscrewing them from the engine.
  • Check for signs of cracks or damage on the coils.
  • Install new ignition coils if any are faulty, ensuring they are seated properly.

4. Check Fuel System

• Tools Required: Fuel pressure gauge
  • Connect the fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position without starting the engine to check for fuel pressure.
  • Compare the reading to the manufacturer specifications (usually around 40-50 psi).
  • If pressure is low, inspect and replace the fuel filter or fuel pump as needed.

5. Inspect Vacuum Lines

• Tools Required: Basic hand tools
  • Visually inspect all vacuum lines for cracks, splits, or disconnections.
  • Replace any damaged vacuum lines with new ones.

6. Perform Compression Test

• Tools Required: Compression gauge
  • Remove all spark plugs.
  • Insert the compression gauge into each cylinder and crank the engine.
  • Compare the readings to the manufacturer’s specifications. Low compression may indicate internal engine problems; further investigation will be necessary.