how to fix P0301 misfire code on my Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool for safety.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
  3. Remove the spark plug using a spark plug socket and ratchet.
  4. Inspect the old spark plug for wear; replace it with a new spark plug of correct specification (e.g., NGK or Denso).
  5. Reinstall the spark plug and tighten it to the manufacturer’s torque specification (usually around 13 lb-ft).

3. Replace Ignition Coil

• Sub-steps:
  1. After removing the spark plug, inspect and test the ignition coil for resistance; replace if faulty.
  2. Install the new ignition coil ensuring it seats correctly in the spark plug hole.
  3. Reconnect the electrical connector and secure with the retaining bolts.

4. Clean or Replace Fuel Injector

• Sub-steps:
  1. Remove the fuel rail by unbolting it from the intake manifold.
  2. Disconnect the fuel injector connector and unscrew the injector from the rail.
  3. Clean the injector using a specialized cleaning solution or replace it with a new injector if necessary.
  4. Reinstall the fuel injector into the rail, making sure it is securely seated.

5. Reassemble and Test

• Sub-steps:
  1. Reinstall the fuel rail and secure it to the intake manifold.
  2. Reconnect all electrical connectors and the battery.
  3. Start the engine and allow it to reach operating temperature.