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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down if it has been running.

2. Replace Spark Plugs

1. Remove the ignition coil cover (if applicable) by unscrewing the bolts.
2. Disconnect the wiring harness from each ignition coil.
3. Remove the ignition coils using a socket set.
4. Unscrew the old spark plugs with a spark plug socket.
5. Install new spark plugs by hand, then tighten them to the manufacturer's specified torque (typically around 13-16 lb-ft).
6. Reinstall the ignition coils and reconnect the wiring harness.

3. Inspect and Replace Fuel Injectors (if needed)

1. Relieve fuel system pressure by removing the fuel pump fuse and running the engine until it stalls.
2. Disconnect the fuel injector connectors and fuel lines (use caution and have a container to catch any fuel).
3. Remove the fuel injectors from the fuel rail.
4. Install new or cleaned injectors, ensuring O-rings are properly seated.
5. Reattach the fuel lines and connectors, ensuring no leaks.

4. Check Ignition Coils

1. Test each ignition coil with a multimeter for proper resistance according to specifications (typically around 0.5-2 ohms).
2. Swap any faulty coils with known good ones and observe if the misfire follows.
3. Replace any defective coils.

5. Inspect for Vacuum Leaks

1. Use a smoke machine to introduce smoke into the intake system to identify leaks.
2. Inspect all vacuum hoses and connections visually and replace any damaged components.