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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector and remove the coil from cylinder 1.
  3. Unscrew the spark plug using a spark plug socket and ratchet.
  4. Install the new spark plug, torquing it to manufacturer's specifications (generally around 13 lb-ft).
  5. Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the spark plug was fine, check the ignition coil for damage.
  2. Use a multimeter to test the ignition coil's resistance (consult service manual for specific values).
  3. If faulty, remove the ignition coil and replace it with a new one.
  4. Reconnect the ignition coil connector.

4. Test Fuel Injector

• Sub-steps:
  1. Remove the fuel rail to access the injector for cylinder 1.
  2. Inspect the injector for clogs; clean or replace if necessary.
  3. Reinstall the fuel rail, ensuring all connections are secure.

5. Check for Vacuum Leaks

• Sub-steps:
  1. Inspect all vacuum hoses and connections for cracks or disconnections.
  2. Use carburetor cleaner or a smoke machine to detect leaks.
  3. Repair or replace any damaged hoses as needed.