how to fix P0301 misfire code Toyota Corolla E210 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal for safety.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil from the spark plug.
  3. Remove the spark plug using a spark plug socket.
  4. Inspect the spark plug for wear or damage; replace if needed.
  5. Install a new spark plug, tightening to the manufacturer’s specifications (typically 13-16 ft-lbs).
  6. Reconnect the ignition coil.

3. Test and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the spark plug is in good condition, test the ignition coil using a multimeter (check primary and secondary resistance).
  2. Replace the ignition coil if it fails the test.
  3. Install the new ignition coil and reconnect the wiring harness.

4. Inspect and Clean Fuel Injector

• Sub-steps:
  1. Remove the fuel rail attaching bolts and gently pull the fuel rail away from the engine.
  2. Disconnect the fuel injector connectors.
  3. Inspect the injector for clogs; clean with an appropriate fuel injector cleaner if necessary.
  4. Reinstall the fuel rail and ensure all connectors are properly attached.

5. Check for Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum lines connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to identify any vacuum leaks while the engine is running.
  3. Replace any damaged hoses or seals.