how to fix P0300 code on my Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the negative battery terminal to ensure safety.
• Gather diagnostic scan results, if necessary.

2. Replace Spark Plugs

• Remove the ignition coil assembly by unscrewing the bolts and disconnecting the electrical connectors.
• Extract the old spark plugs using a spark plug socket.
• Inspect the gap on the new spark plugs using a feeler gauge and adjust if necessary.
• Install new spark plugs, ensuring they are torqued to 13 lb-ft (18 Nm).
• Reinstall the ignition coil assembly by reversing the removal steps.

3. Test and Replace Ignition Coils (if necessary)

• If any ignition coils are found faulty during inspection, replace them:
  • Remove the faulty ignition coil by unscrewing it from the cylinder head.
  • Install the new ignition coil and torque to the manufacturer's specifications (typically around 8 lb-ft or 11 Nm).
  • Reconnect the electrical connectors and ensure proper seating.

4. Inspect and Repair Fuel System

• Verify fuel pressure using a fuel pressure gauge; it should typically read between 40-50 psi (276-345 kPa).
• If pressure is low, check the fuel pump and filter for blockages or failure.
• Replace the fuel filter if it is clogged and replace the fuel pump if it fails the pressure test.

5. Check for Vacuum Leaks

• Inspect all vacuum hoses for cracks or disconnections.
• Perform a smoke test to identify any hidden leaks in the intake system.
• Replace any damaged hoses or seals found during inspection.