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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts (safety warning).
• Raise the vehicle as needed and secure it with jack stands.

2. Inspect and Replace Spark Plugs

• Remove Ignition Coils:
  • Disconnect the wiring harness from each ignition coil.
  • Remove the bolts securing the ignition coils using a socket set.
• Inspect Spark Plugs:
  • Remove spark plugs using a spark plug socket.
  • Examine plugs for wear or fouling. Replace if necessary.
• Install New Spark Plugs:
  • Gap new spark plugs to specifications (usually around 0.043 inches for a Camry).
  • Install new spark plugs and torque to manufacturer specifications (typically 13 lb-ft).

3. Inspect and Replace Ignition Coils

• Remove Ignition Coils:
  • After removing spark plugs, take out the ignition coils.
• Install New Ignition Coils:
  • Place new ignition coils in their respective positions.
  • Secure with bolts and reconnect wiring harness.

4. Fuel System Inspection

• Check Fuel Pressure:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position without starting the engine, and check for adequate fuel pressure (usually 40-50 PSI).
• Replace Fuel Filter (if applicable):
  • If pressure is low, consider replacing the fuel filter or checking the fuel pump.

5. Air Intake and Vacuum Inspection

• Inspect Air Filter and MAF Sensor:
  • Remove and check the air filter for clogs. Replace if dirty.
  • Clean the MAF sensor with MAF cleaner if needed.
• Check for Vacuum Leaks:
  • Inspect vacuum lines for cracks or disconnections. Replace any damaged lines.