how to fix P0301 misfire code in my Toyota Camry XV40 (2007-2011)

Solution

1. Preparation

• Gather all tools and parts needed before starting.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench
• Remove the ignition coil from cylinder 1 by unbolting it and disconnecting the electrical connector.
• Use the spark plug socket to remove the old spark plug.
• Inspect the spark plug for damage or excessive wear; replace if necessary.
• Install the new spark plug, torquing to the manufacturer's specification (typically around 13 lb-ft).

3. Replace Ignition Coil (if faulty)

• Tools Required: Socket set
• Remove the ignition coil from cylinder 1 as previously described.
• Install the new ignition coil and reconnect the electrical connector.
• Ensure it is secured properly with the mounting bolts.

4. Inspect/Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector removal tool, socket set
• Disconnect the fuel injector electrical connector.
• Remove the fuel rail if necessary to access the injector.
• Test the injector for proper operation using a multimeter or replace it if found defective.
• Reinstall the fuel rail and ensure all connections are secure.

5. Final Checks

• Reconnect the negative battery terminal.
• Start the engine and let it warm up, ensuring that the check engine light does not reappear.