how to fix a P0301 misfire code on my Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Replace Spark Plug

1. Remove the engine cover (if applicable) using a socket set.
2. Disconnect the ignition coil connector from cylinder 1.
3. Unscrew the ignition coil from the cylinder head using the appropriate socket.
4. Remove the old spark plug using a spark plug socket.
5. Inspect the spark plug for wear; replace if necessary. Use an OEM or equivalent spark plug with the correct gap.
6. Install the new spark plug and torque to the manufacturer's specification (usually around 13-15 lb-ft).
7. Reattach the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if needed)

1. If the ignition coil was found faulty during inspection, remove the coil as described above.
2. Install the new ignition coil, ensuring it is seated properly.
3. Reconnect the ignition coil connector.
4. Repeat this for any other cylinders if misfires are present beyond cylinder 1.

4. Check Fuel Injector

1. If the injector was found faulty, remove the fuel rail assembly (ensure the fuel system is depressurized).
2. Replace the fuel injector for cylinder 1.
3. Reinstall the fuel rail and ensure all connections are secure.
4. Reconnect the battery and check for leaks.