how to fix P0301 misfire code on my Toyota Corolla E140 (2006-2013)

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Allow the engine to cool before proceeding.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1:
  1. Unplug the electrical connector from the ignition coil.
  2. Remove the mounting bolts using a socket set.
  3. Carefully lift out the ignition coil.
• Remove the spark plug:
  1. Use the spark plug socket to unscrew the old spark plug.
  2. Inspect the spark plug for wear and replace it if necessary.
• Install the new spark plug:
  1. Apply anti-seize compound to the threads of the new spark plug.
  2. Hand-tighten the spark plug, then torque it to the manufacturer's specification (typically around 13-15 ft-lbs).

3. Replace Ignition Coil (if faulty)

• If the ignition coil tests faulty:
  1. Install the new ignition coil in cylinder 1.
  2. Reconnect the electrical connector.
  3. Ensure all connections are secure.

4. Inspect and Clean Fuel Injector (if needed)

• If the fuel injector is clogged:
  1. Remove the fuel injector from cylinder 1 (may require fuel line removal).
  2. Clean the injector using a specialized cleaner or replace it if necessary.
  3. Reinstall the injector and ensure proper sealing.

5. Final Assembly

• Reinstall the ignition coil (if removed).
• Reconnect the battery terminal.
• Start the engine and check for smooth operation.