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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety during repairs.
• Allow the engine to cool if it has been running.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Unplug the electrical connector from the ignition coil.
  • Remove the mounting bolt(s) using a socket set.
  • Carefully lift the ignition coil out.
• Remove the spark plug:
  • Use a spark plug socket and ratchet to unscrew and remove the spark plug from cylinder 1.
• Install the new spark plug:
  • Apply anti-seize compound to the threads of the new spark plug.
  • Hand-tighten and then torque to manufacturer specifications (typically 13-15 lb-ft).

3. Replace Ignition Coil

• If the ignition coil is faulty, install a new ignition coil:
  • Position the new ignition coil over the spark plug and press down firmly.
  • Reinstall the mounting bolt(s) and tighten to manufacturer torque specifications (usually around 80-100 inch-lbs).
  • Reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Remove the fuel injector from cylinder 1:
  • Disconnect the fuel injector connector.
  • Remove any retaining clips and fuel lines carefully.
  • Pull the fuel injector out of the intake manifold.
• Clean or replace the fuel injector:
  • If cleaning, use a fuel injector cleaner spray and ensure proper reinstallation.
  • If replacing, install the new injector and ensure it is seated properly.

5. Final Assembly

• Reinstall any components removed during the process.
• Reconnect the negative battery terminal.