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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool; disconnect the negative battery terminal to prevent electrical shorts.
• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, fuel pressure gauge, compression tester.

2. Inspect and Replace Spark Plugs

• Remove the ignition coils using a socket wrench.
• Carefully remove the spark plugs using a spark plug socket.
• Inspect the old spark plugs for wear, fouling, or damage.
• Install new spark plugs, ensuring they are gapped correctly as per manufacturer's specifications. Torque to the manufacturer's specifications.
• Reinstall the ignition coils and ensure they are seated properly.

3. Check and Replace Ignition Coils

• If misfiring persists after replacing spark plugs, test the ignition coils using a multimeter for proper resistance.
• Replace any faulty ignition coils with new ones, ensuring they are compatible with the vehicle.
• Reinstall the ignition coils securely.

4. Inspect Fuel System

• Connect the fuel pressure gauge to the fuel rail and turn the ignition on (without starting the engine) to check fuel pressure.
• If the pressure is low, check the fuel filter and replace if necessary.
• If the pump is faulty, replace it with a new fuel pump, ensuring to follow safety procedures.

5. Inspect for Vacuum Leaks

• Visually inspect vacuum hoses for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to identify any vacuum leaks while the engine is running.
• Repair any leaks found by replacing or reconnecting hoses.

6. Compression Test

• Remove spark plugs and connect the compression tester to each cylinder.
• Crank the engine and observe the compression readings.
• If any cylinder shows low compression, investigate further for potential mechanical issues and repair as necessary.