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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent electrical shorts during repairs.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if necessary.
• Disconnect the ignition coil connector from cylinder 1.
• Remove the ignition coil from cylinder 1 by unbolting it and lifting it out.
• Use a spark plug socket to remove the old spark plug from cylinder 1.
• Inspect the new spark plug and ensure it is gapped correctly according to specifications (typically 0.044 inches for a Toyota Camry).
• Install the new spark plug and torque it to the manufacturer's specifications (typically 13 lb-ft).
• Reinstall the ignition coil and reconnect the wiring harness.

3. Replace Ignition Coil (if necessary)

• If the ignition coil tested faulty, replace it with a new one.
• Tools Required: Socket set
• Follow the same steps as for the spark plug to access and remove the ignition coil.
• Install the new ignition coil and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit or noid light
• Disconnect the fuel injector connector from cylinder 1.
• Use a noid light to check for electrical signal; if no signal, inspect wiring and ECU.
• If the injector is clogged, use a fuel injector cleaning kit to clean it or replace the injector if necessary.

5. Final Assembly

• Reinstall any components removed during the repair (engine cover, air intake tubing).
• Reconnect the battery.