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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plugs

1. Remove the engine cover (if applicable) using a socket set.
2. Disconnect the electrical connectors from the ignition coils.
3. Remove the ignition coils using a socket set.
4. Extract the spark plugs using a spark plug socket.
5. Inspect the spark plugs for wear; replace them if they show signs of damage or excessive wear (gapping new plugs to the manufacturer's specification).
6. Reinstall the spark plugs and torque them to the manufacturer’s specification (typically around 13-16 lb-ft).
7. Reinstall the ignition coils and reconnect electrical connectors.

3. Inspect and Replace Ignition Coils (if necessary)

1. If ignition coils were found to be faulty during inspection, remove them as described in the previous step.
2. Install new ignition coils, ensuring they are seated properly.
3. Reconnect electrical connectors.

4. Check and Clean Fuel Injectors

1. If fuel injectors are suspected to be clogged, remove them using appropriate tools.
2. Use a fuel injector cleaning kit to clean the injectors or replace them if they are damaged.
3. Reinstall the fuel injectors and ensure proper sealing.

5. Address Vacuum Leaks

1. Inspect all vacuum lines and the intake manifold for cracks or disconnections.
2. Replace any damaged hoses and re-seat any loose connections.
3. Perform a smoke test if necessary to confirm the absence of leaks.

6. Test Fuel Pressure

1. Connect a fuel pressure gauge to the fuel rail.
2. Turn the ignition key to the "on" position without starting the engine and check the pressure reading.
3. Compare the reading to the manufacturer's specifications; replace the fuel pump or filter if pressure is low.