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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shock.
• Allow the engine to cool for at least 30 minutes.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Disconnect the electrical connector from the ignition coil.
  • Remove the bolts securing the coil using a socket set.
• Remove the spark plug:
  • Use a spark plug socket to unscrew the spark plug from the cylinder.
  • Inspect the old spark plug for fouling or damage.
• Install the new spark plug:
  • Apply anti-seize compound on the threads (if required).
  • Torque the spark plug to 13 lb-ft (17.6 Nm).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

• If the ignition coil was inspected and deemed faulty:
  • Remove the ignition coil as described above.
  • Install the new ignition coil by reversing the removal steps.
  • Ensure it is secured properly and the connector is attached.

4. Inspect Fuel Injector (if necessary)

• Check the fuel injector's electrical connector for damage and secure connection.
• If the fuel injector is faulty, replace it:
  • Remove the fuel rail as per manufacturer instructions.
  • Disconnect the fuel injector harness.
  • Remove the old injector and install the new one, ensuring O-rings are lubricated and seated properly.

5. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0301 code.