how to fix a misfire on my Toyota Corolla E210 (2019-2024) with code P0301?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.
• Raise the vehicle, if necessary, and secure it on jack stands.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1:
  • Disconnect the electrical connector from the ignition coil.
  • Unbolt the ignition coil and remove it from the spark plug.
• Remove the spark plug:
  • Use the spark plug socket to unscrew and remove the spark plug.
• Inspect the spark plug for fouling, wear, or damage.
• Replace with a new spark plug (ensure it meets OEM specifications):
  • Torque to the manufacturer’s specifications (typically around 13-16 lb-ft).
• Reinstall the ignition coil.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil appears faulty during inspection:
  • Remove the coil as described above.
  • Replace with a new ignition coil compatible with the Toyota Corolla E210.
  • Reconnect the electrical connector securely.

4. Inspect and Replace Fuel Injector (if necessary)

• If the fuel injector is suspected to be faulty:
  • Disconnect the fuel line and electrical connector from the injector.
  • Remove the fuel rail (if applicable) to access the injector.
  • Replace with a new fuel injector that matches OEM specifications.
  • Reassemble the fuel rail and reconnect the fuel line.

5. Reassemble and Reconnect Battery

• Ensure all components are securely reinstalled.
• Reconnect the battery terminals.